Bridge Mode on 5268AC FXN and possible cancellation

I was quite excited to be the first in the neighborhood to have fiber installed, I guess it was we never received any advertisements that it was available. 

It took a few weeks, but despite controversy about whether it really was available we had it installed. 

The first AIO modem/router had some great speeds, but fairly poor page load speeds. I called AT&T support and they wanted to direct me to paid support. I wanted to be able to use their unit with my Eero mesh system. I called Eero and they helped, but things were still problematic. 

I then contacted support and specifically requested a modem that supported bridge mode and it was shipped. It has no specific bridge mode, but with the help of the internet I had it up and running as a modem, Eero doing the rest, for a while that was. 

Today I put Eero in bridge mode, page load speeds still slower than if I used Eero to do all the heavy lifting. It's been years since I had DSL, but I now remember how hard it was to get anything working with a non-cable internet provider. To add insult when I called Charter they offered me their faster internet at a cheaper price than my 60/4, despite their website saying I could only get it if I also subscribed to phone or TV.

For the moment I'm frustrated with the ability of the two modems to work with Eero and the reliability of workarounds. I know it's been asked before, and I've read the solutions, but is there a best way to get the 5268AC in bridge mode? 

If not what would I be looking at for cancellation on the service I started just days ago?