Inconsistent speeds on Gigabit - Jacksonville FL

To knock out the basic stuff first.

- On a gaming PC with NVMe SSD, gigabit ethernet adapter, plenty of disk space, ram, processing power, etc.
- Hardwired to the provided Gateway with Cat 5E.
- Computer is capable of near-gigabit speeds, evidence provided in screenshots.

We signed up for gigabit service appproximately 3 weeks ago and it has been up and down. I called in and spoke with a tech that checked my signal levels on my modem, who described them as a "roller coaster that you would not want to get on". The phone tech says we need a service visit.

We get someone sent out to the house, he runs his tests, says the signal levels are fine, smooth as glass. This isn't adding up. He has me run a speedtest of Ookla. It gets 930-something while the tech is there, to a Comcast-provided Ookla server. Cool. Tech leaves, almost leaving his equipment bag (had to run it out to his truck so he wouldn't forget it!) having done nothing relevant to fix anything. (Which is funny because I got a billing for $70 for a failed SIK. You can bet I'll be disputing that! Edit: Dispute for the $70 was successful, after spending 2 hours on the phone with the out of country call center. Great use of my time that was. )

On Steam, my download speeds are hot garbage, max 240Mbit/s if I'm lucky, regardless of the CDN server that I pick. My streaming boxes buffer from time to time, regardless of correct wifi networks picked (I don't have a large house, signal is near-perfect), and sometimes on YouTube I get suggested 720p instead of 1080p for videos that support it. Something is going on, but I can't seem to get the help I need to fix it.

For fun I also ran some testmy.net speed tests that were consistency-based rather than a quick burst like Ookla. That looks even worse for "Gigabit".

Is there a bad node near Jacksonville that is causing problems? Is it our neighborhood? What's the deal?

Tried adding photos on site. The photo upload tool is broken. Irony. Here are the screenshots. https://imgur.com/a/EkGkVL6

Edit: Statistics updated 1-15 9:20 PM

Index	2	1	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	32	33	34	35	37
Lock Status	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked	Locked
Frequency	489 MHz	483 MHz	495 MHz	501 MHz	507 MHz	513 MHz	519 MHz	525 MHz	531 MHz	537 MHz	543 MHz	549 MHz	555 MHz	561 MHz	567 MHz	573 MHz	579 MHz	585 MHz	591 MHz	597 MHz	603 MHz	609 MHz	615 MHz	621 MHz	627 MHz	633 MHz	639 MHz	459 MHz	465 MHz	471 MHz	477 MHz	690 MHz	611600000
SNR	41.8 dB	41.7 dB	41.7 dB	41.4 dB	41.3 dB	41.3 dB	41.4 dB	41.5 dB	41.4 dB	41.4 dB	41.3 dB	41.4 dB	41.1 dB	41.0 dB	40.9 dB	40.9 dB	41.0 dB	40.8 dB	40.8 dB	40.7 dB	40.6 dB	40.7 dB	40.6 dB	40.4 dB	40.4 dB	40.2 dB	40.2 dB	41.8 dB	41.8 dB	41.7 dB	41.7 dB	39.3 dB	NA
Power Level	4.1 dBmV	4.1 dBmV	4.1 dBmV	4.1 dBmV	4.1 dBmV	4.0 dBmV	4.2 dBmV	4.4 dBmV	4.4 dBmV	4.3 dBmV	4.4 dBmV	4.4 dBmV	4.4 dBmV	4.4 dBmV	4.5 dBmV	4.4 dBmV	4.7 dBmV	4.7 dBmV	4.9 dBmV	4.8 dBmV	4.8 dBmV	4.8 dBmV	4.7 dBmV	4.5 dBmV	4.6 dBmV	4.5 dBmV	4.6 dBmV	4.3 dBmV	4.3 dBmV	4.2 dBmV	4.2 dBmV	4.8 dBmV	NA
Modulation	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	256 QAM	OFDM	OFDM

Upstream	Channel Bonding Value
Index	1	2	3	4
Lock Status	Locked	Locked	Locked	Locked
Frequency	35 MHz	29 MHz	23 MHz	16 MHz
Symbol Rate	5120	5120	5120	5120
Power Level	38.8 dBmV	38.8 dBmV	38.3 dBmV	37.8 dBmV
Modulation	QAM	QAM	QAM	QAM
Channel Type	ATDMA	ATDMA	ATDMA	ATDMA

CM Error Codewords
Index	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32
Unerrored Codewords	2742848917	3355545751	3355550351	3355554443	3355556260	3355572923	3355574479	3355586033	3355628985	3355643035	3355642931	3355637424	3355660730	3355646225	3355653355	3355659151	3355274118	3355267435	3355257896	3355270731	3355306716	3355323825	3355340257	3355333447	3355368829	3355368758	3355380942	3355410523	3355345146	3355361316	3355410486	2742848917
Correctable Codewords	652190743	264	255	276	270	260	279	269	267	253	266	275	259	277	271	263	265	255	225	231	271	285	246	286	265	260	238	265	243	214	243	652190743
Uncorrectable Codewords	0	1297	1308	1303	1292	1319	1303	1309	1305	1350	1326	1287	1322	1287	1294	1324	1327	1321	1138	1127	1317	1327	1368	1332	1342	1357	1383	1296	1112	1151	1315	0

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Inconsistent speeds on Gigabit - Jacksonville FL

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