There are passive hdmi to ethernet adptors. I am assuming you can use them in reverse and get ethernet over the cables I would assume all pairs are connected.

We installed one at woek for hdmi but never checked to see if it used all 8 pairs.

https://www.milestek.com/p-16217-hdmi-over-cat5ecat6-extender-balun-passive

This lookes really expensive the set we used was super cheep and had female hdmi for wallplates.

I would run a few speedtests from a few different devices ookla and the like to get a better picture of if ypu are actually using the faster speeds.

T-mobiles home internet is likely over gsm. I have herd good things about that but I would look at your current provider to see if they have cheeper plans. Before making the switch to t-mobile.

However as much as the other person was downvoted. I would doubt that you would notice much of a difference having a 100mbps internet package with your usage. That $50/ month is pritty significant.

This is spot on. Freah tomato is another wrt option.

And that 54mbps is max theoretically usally you get about 70% real world and as you want it as a repeter split that connection in 1/2

The rt1800 can be flashed with open wrt giveing you alot of control

https://openwrt.org/toh/hwdata/belkin/belkin_rt1800_v1

However it seems your spectrum device is 4x4 mimo vs the belken 2x2.

https://fccid.io/VW3FAST5285/Test-Report/Test-Report-5GB1-B4-4851412#google_vignette

So aside from the improved control it would be a multi client wifi performance downgrade.

The belken should beable to nat you connection. So the main difference is control or extra wifi bandwidth between multiple devices.

As the other commenter said the upload speed is suspect for fiber but that doesn't really matter.

That TP-Link WDR3600 is a wireless n only router best case on wifi you are looking at only 100-150 mbps.

And I don't have a good sample of nat performance but it seems to be only arround 100mbps on a basic gargoyle install.

https://www.gargoyle-router.com/phpbb/viewtopic.php?t=9029

Where you using powerline on the TP-Link TL-WPA7617?

I don't know how advanced you rules in gargoyle are and that will limit your device selection.

If doing powerlinr i would recommend just using a normal powerline ethernet bridge and then connecting a ap to that.

The broken tplink is likely under warranty, my experience with tplink warranty was pritty good.

And finally do you have any coax lines or ethernet lines ran in your house?

If those jacks allready exzist they likely run to one central place in the house (unless this is converted phone line).

You will likely need to connect thise two cables at the centrual point. (Or put a switch there and connect up the rest of the house as well.)

We generally recommend lv techs instead of electricians as data cabling is slightly different than electrical.

Moca sounds like the best option in this situation along side a mesh system.

Some other users here have written very helpful guides stealing https://www.reddit.com/user/plooger/ 's link

https://www.reddit.com/r/HomeNetworking/comments/15ick7f/comment/jutk8bi/

It is possible that the tech removed a spitter somewhere so the coax run you where using before is now disconnected. This is just an add on to the other recommendations posted allready.

The c7 has peitty slow nat performance but not 250mbps slow nat performance. (Unless you are running sqm)

https://www.reddit.com/r/openwrt/comments/oe43kb/tplink_archer_c7_v2_openwrt_nat_sqm_offloading/

I don't know where the 2 year term and $30 extra comes in to play. (Rental of new rotuer with package)

Ontario does have a law if you signed a contract in your home you have 15 days to cancel. No questions asked. Tellus is only a isp out west so i wonder if your province has a similar law.

I woud try enabled the flow offloading feature if you haven't.

Very unlikely to get close to 1gbs in real world situations with wifi ac. Newer wifi ax is more likely to get there. (Probably what he's talking about.) But we are talking about a hard wired connection here so pritty moot.

How are your decos wired together?

If they all have ethernet backhaul and go through the modem than that is your issue.

Also what pools said. As your Virgin hub is now in modem mode the decos have to be in router mode as your modem will (likely) only provide one ipv4 address. There for only 1 device can be connected and nothing else will be able to talk to eachother.

If you have 2 runs you can do passive hdmi over ethernet. Probably not great for the higer bandwidth signals as well.

If your allready transcoding just go for the extenders that use IP and can go through a switch.

If you want to know how I would set up the network, I'd flash the access points with the merlin builds.

https://github.com/gnuton/asuswrt-merlin.ng

This shoud give you the flexibility to do alot of cool things. But won't nessarialy directly help with gaming.

The second thing I would do is enable some fourm of qos. Probably asus adptive qos to not impact the line rate too much. As with twitch or multi steaming you may be pushing closer to that upload speed limit some fourm of qos on the upload would be recommend. Download being 1gb may not get saturated and not need qos.

Just my 2c