Help with New Apartment Setup - AP's vs Wired Mesh, also somethings wrong.

So I just moved to a new apartment and got Fios 400/400 plan installed. In my previous apartment I had an ER-X and AC-Lite combo and it worked great. I'm not going to tinker with it much, so I didn't love the software but I got it working just fine.

So I install the ER-X/AC-Lite at the new place after Fios sets up (ethernet straight from the ONT, no Coax/Moca) and I'm not getting much more than 150 MBPS wired. Fios guy said it's because I'm not using his router, he plugged in his own router and I was able to get 400+ in both directions over wifi so he left.

I couldn't replicate that with my own setup. So I went to Microcenter to try out some things. I picked up a Google Wifi pack and a USG.

I tried just one Google puck and everything was in the 300ish range over wifi and near 500 wired(using fast.com, google speed test was a little slower).

I then tried the USG. Wired it was just as fast as the Google puck, but speeds over the AC-Lite were back below 100. I tried the Google Puck in bridge mode off the USG and the speeds were great so I figure it was something with the AC-Lite.

So I try the ER-X wired again (side note- i enabled offloading), still slow. So I'm thinking maybe it's the POE injector. I had the line going from the ONT to the POE injector then to the ER-X and AC-Lite powering both of those. I used the USG wall plug for the ER-X and skipped the POE as the ER-X powered the AC-Lite. Wired to the ER-X speeds are fantastic (near 500+) and AC-Lite is just fine (250ish).

So I'm thinking it's the POE now. I can replace that or just get a plug for the ER-X. I do like the way the USG looks and the software is nice though. Performance wise- would there be a reason to not return the USG and use it over the ER-X. My only issue with the USG is it won't run two LAN's at once.

So the apartment is only about 800 SF, but it's got a lot of brick and plaster walls. 35 feet away from the router in the bedroom (opposite end), speeds drop dramatically. Not an issue though, I got COAX running the exterior, I'll just replace it with Cat6 and put a AP in the bedroom at the other side of the apartment.

So if I wanted to keep the USG, I'd need to get switch which would be an additional piece of hardware I'd like to avoid if I can. Unless something like a NanoHD is that much better than an AC-Lite that it could get through those walls, I doubt it.

So I'm thinking I have two options.

1- Buy a NanoHD and new POE or wall plug for the ER-X. NanoHD in the living room, AC-Lite wired in the bedroom.

2- Just use the Google Wifi, wire a puck in each room and put the third somewhere in the middle without a wire.

3- Keep the USG and run a NanoHD or AC-Pro and see how far it reaches.

I like idea 1 the best, but given that my AC-Lite wasn't as fast as the Google wifi, I'm wondering why bother jumping through hoops with the software. I don't tinker with it much, I just want something solid that reaches through the apartment and into the backyard a bit. I'm also open to a different system, but I couldn't find one that fit my needs. I didn't want to spend Orbi money as I'll wire it anyway, Amplifi wouldn't let me wire up the extenders, Eero won't either.

Any advice is greatly appreciated.