AXE5300 poor wireless backhaul signal
Just bought the AXE5300 3 pack Deco mesh from Costco. Initial speeds are increased compared to my Orbi but I'm getting a weak signal regarding wireless backhaul (only 2 bars in "Brian's Office"). I'm directly below the main router on another floor but otherwise there's nothing except drywall that could degrade the signal. My 1 GBPS speed drops to 96 mbps which is really bad. I tried moving the node but still can't get a stronger signal. Sadly it's impossible to do a wired backhaul since the home isn't wired for ethernet. It's also strange it says my speed is only 25 kbps when Speedtest says 965mbps.
Any suggestions?