Experiencing Slow Speeds

Having been dealing with this problem since upgrading plan from 300MB to 1GB almost 2 weeks ago.  Technician came out, didn't check outside service PED, Meter room supply cable or cable modem inside but closed case as modem (Arris SB6190) was likely bad.  Didn't check any inside jacks either.  Wanted to concentrate on my cable boxes, their usage and checking them.

Advised digital care team who is having someone come out again tomorrow.  Told them I completely isolated my service from inside by connecting directly to the main supply line that comes into my condo unit and nothing changed.  Speed before upgrade was consistently over 200MB wifi and close to 300MB when hardwired.  After upgrade, speed in both situations dropped to on average 92MB.  Digital care still wants to fall back to it's something inside condo when I troubleshooted essentially connected outside the unit.

Quite frustrating.  I've checked power, SNR on DL stream and power on UL stream and they all seem to be within range.  I bought a new modem, (same SB6190) activated and have the same problem, so between using new modem and connecting outside unit strongly suggests this is not my wiring, splitters or anything else connected to my unit but is outside and completely under XF responsibility.

I'd be happy to DM someone my name and address for service if you can provide any other options.  I'm thinking I'm going to get the same third party "authorized contractor" show up tomorrow and get no where!