Year long issues, need resolution. 200-500ms latency spikes and packet loss

I've been battling issues officially for 1 year and I'm not sure what else I can do. I've had 8 technicians come out recently, 4 of them being level 2 technicians and I'm getting nowhere (One of the technicians didn't know what latency was and only 1 knew very little about downstream channels). I work in IT and from home and have servers for my business that I rely on and I'm drawing the conclusion that I just may need to move to get this resolved (I'm desperate for a resolution).

I have a 2gb/s tier plan (unlimited) that I can't fully utilize because the packet loss is worse under load. I have Qos throttled all the way down to 150mbp/s to my main desktop (Hardwired with a cat8 cable, and yes I've tried different cables and multiple computers). Bufferbloat tests have 100ms+ latency on download but upload is always fine.

I've connected directly to the modem with a public ip and same issues.

I had the xb7 when I started having issues. It was then replaced with the xb8 as a "solution". The issues compounded with the xb8 and it was dropping connections (Downstream channels would drop to 1 locked QAM channel with correctable's in the hundreds of millions)

https://ibb.co/rKzdv5Fn

The xb8 was replaced with another xb8 by a technician with obvious no change. One level 2 technician finally found "something" after I unfortunately had to hard press them into checking more than the standard "Green checkmark means your connection is fine". Their statement to me was that a 3rd party company installs the lines (I'm assuming to the nodes??) and never balanced it then submitted a ticket and left) Note nothing has changed, still having issues.

I added an attenuator since the channels were hot (I couldn't get a technician to install one and he tried telling me the higher the power the better(which was eventually replaced by another technician because my attenuator wasn't "approved" by xfinity))

https://ibb.co/dwy7YJjR

I got very minor improvement after I added one, which was a small victory for me since this had already been going on for about 6 months. Here is the trace route with a minor congruent downstream load:

  2    16 ms    17 ms    19 ms  ---.--.--.--- (redacted public ipv4)
  3     *      216 ms    30 ms  po-309-339-rur301.audubon.nj.panjde.comcast.net [68.86.192.13] 
  4     8 ms     8 ms     7 ms  po-2-rur302.audubon.nj.panjde.comcast.net [68.86.209.234] 
  5    27 ms    30 ms    33 ms  po-300-xar02.audubon.nj.panjde.comcast.net [68.86.152.13] 
  6    26 ms    32 ms    35 ms  be-25-rar01.absecon.nj.panjde.comcast.net [68.85.63.61] 
  7   230 ms    24 ms    23 ms  be-101-ar03.plainfield.nj.panjde.comcast.net [96.108.49.105] 
  8    38 ms    29 ms    29 ms  be-31123-cs02.newark.nj.ibone.comcast.net [96.110.42.37] 
  9    30 ms    35 ms    45 ms  be-1211-cr11.newark.nj.ibone.comcast.net [96.110.35.70] 
 10   249 ms    26 ms    22 ms  be-302-cr12.newyork.ny.ibone.comcast.net [96.110.36.150] 
 11    43 ms    48 ms    48 ms  be-1112-cs01.newyork.ny.ibone.comcast.net [96.110.35.129] 
 12     *      223 ms    17 ms  be-4101-pe01.60hudson.ny.ibone.comcast.net [96.110.41.146] 
 13     *        *        *     Request timed out.
 14     *        *        *     Request timed out.
 15     *        *        *     Request timed out.

I then ditched the xb8 entirely and bought a 2.5gbps modem and made my own x86 based openwrt router since the provided gateway and router has no Qos, SQM or any shaping of some sort. I've also forced SSL on the DNS to avoid dns hijacking and routing to comcast development centers with no improvement. I now have a 10gbps wired connection from my desktop to my router and 2.5gb full duplex to the modem.

Here is the current logs / state of my modems connection (Hitron CODA56)

https://ibb.co/9953QVnS

https://ibb.co/cSRhSzD6

https://ibb.co/N6dv3H1c

You can clearly see the issue with the OFDM downstream channel. Here are the logs:

https://ibb.co/bgpR2wMp

https://ibb.co/hRSYn19b

I've had a level 2 technician come today and 30 seconds into showing him logs and explaining the situation to him they say "I have no idea what you're talking about, I can only change out modems really and what your talking about is done by the boom truck guys. "But I see you have your own modem so there's nothing I can check". He then proceeds to show me some "test" that has some green checkmarks next to it.

I'm desperate to talk to someone that knows absolutely anything about resolving this. I can't keep having technicians come out and not even know what latency is; I gave one technician a complete basic networking lesson because I felt bad. I get charged $100 for this on top of it for the visit. I'm so frustrated, I'm to the point of wanting to move! 

I don't know what else I could physically do on my end, I've tried everything I could think of.


-------------- EDIT / UPDATE -----------------------
2/13/2025
Support told me that there was a ticket for planned maintenance on 2/11/25 and expect my internet to go out. Well my internet never went out according to the logs so I can assume nothing was actually performed.

Here is the current downstream OFDM state:
https://ibb.co/NgFBprHN

I am still unable to speak with someone that actually knows anything or seems to care to be honest and personally this has gone too far as it has no? It's been a year! Why is this so difficult to explain? I'm literally showing your level 2 technicians the logs but because green checkmark means good, then have the audacity to charge me $100 for wasting MY time. 

--------- EDIT / UPDATE -----------------
A technician came today 02/14/24 (One was supposed to come yesterday but never called or knocked when they got here and just left, which wasted two hours of my time)

Today's technician was the best so far, which I am grateful for (Managers, please give this man some positive feedback at minimum). He ran a new line from my modem to the junction box outside of my apartment (Which was a nice change as he at least attempted to help me resolve this issue). This did help a little but only because the ofdm downstream channel's power increased. Unfortunately, as a result the entirety of other channels are now running HOT and on the upper end / outside of spec (I don't think I am going to add an attenuator as I do see minor improvement at least, although still unacceptable to say the least) 

Here is the current state:

The journey to Internet with decent latency and no packet loss continues <-----------------