@OL1v3r what modem are you currently using? That can be seen on the product sticker at the back of the modem. It should be a CGN3xxxx variety or CODA-4582 which is the newest gigabit modem that Rogers has deployed.
Can you log into the modem, navigate to the DOCSIS WAN tab, copy the Downstream and Upstream table and paste that into a post. The copy and paste process will paste in the text contents of the tables. The signal levels and signal to noise ratios which are in those tables will be of interest given your comments on disconnects.
Are you seeing disconnects on ethernet or wifi connected devices or both?
"Question is is there a way to prioritize the PC with the power line Ethernet so that it gets the full 80 Meg's? "
Yes there is. You would need to run a router that has bandwidth controls in the firmware that would allow you to select 80 Mb/s or maybe slightly higher, so that the powerline pc sees the max bandwidth you could get thru the powerline adapters. That might be done thru port priority. All others would see less bandwidth, depending on the user entered bandwidth for each port, or possibly device MAC.
Out of curiosity, are your powerline adapters Homeplug AV2 qualified? Those adapters use all three prongs, line, neutral and ground, on the socket to run data, whereas the previous generation would only have and use two prongs, line and neutral. The Homeplug AV2 adapters are much faster than the previous generation.
@Mythen I'm surprised that you see data rates as low as 80 Mb/s thru the adapter set, and then, I'm not surprised. The data rate will depend on the background electrical noise and on the path itself. Have a look at your electrical panel. Ideally, both adapters would be on the same side of the panel, left or right. If they aren't on the same side of the panel, see if you can come up with some way to experiment, so that moving either end will place it on the same side of the panel as the other end. See how much of an effect that has. Other point to note, you don't want the adapter to be on a circuit that has a Ground Fault Interrupter socket, as is found in bathrooms. That will drastically drop the data rate thru the adapter set.
In terms of routers, Asus routers appear to have the bandwidth controls that you are looking for in the QOS section. Fwiw, I'm not sure if enabling bandwidth controls, which appear to be imposed by client name will have any effect on the routers Hardware Acceleration. This is Broadcom's Cut Through Forwarding (CTF) and Flow Acceleration (FA), which is a proprietary piece of Broadcom firmware. This appears to route external port data to internal ports with very little if any involvement from the router CPU. Typically, traditional QOS disables CTF and FA. However, this is listed as a separate item within the QOS area, but it doesn't appear to be necessarily associated with QOS itself, so, no way to guarantee that this will or won't affect CTF and FA. I'll have to experiment with it to see what happens.
The problem with disabling CTF is that its necessary to run speeds over 100 Mb/s. Given your indication that your on a 250 Mb/s download rate, thats a concern. Netgear routers will be the same, but they're worse as there isn't any method to determine if the CTF is disabled or not, with Asus firmware there is a checkbox that users can check to determine if CTF has been disabled or not.
At the first opportunity tonight or tomorrow I'd check this out to see what happens.
Here's a screenshot of the Bandwidth Limiter section:
Are you considering an all in one router (ethernet + wifi) or considering an ethernet router only.
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