I have 1000mb with AT&T fiber with their newer BG320 modem.  Have 2 x90 in my 2500sqft home with each access point of a different end of the house with Ethernet backhaul.  I have the x90 setup in access point mode with the wifi with the BG320 turned off.  The main x90 sits right next to the BG320 modem. When within 6ft no obstructions I am getting slower speed than I was with wifi 6 built in with the BG320.  BG320 I would see around 650-700mb up and down.  Now with the x90 plugged into the 2.5gb port on the x90 and BG320 I am only seeing speeds of 600-650 down and 400-500mb upload.  Testing is done with speedtest net app on same iPhone 13 pro for both scenarios.  Newer hardwired devices are seeing 950 up and down which indicates a good network. 

Have tried the network optimization tool several times with no success.  At this large price point I was expecting at least same if not faster speeds when in good wifi signal strength.

Thoughts?  AT&T Fiber will soon be offering faster speeds than 1000mb and would like to take advantage of the faster speeds when available.