ORBI RPS750 (RPK753S) ax4200 wireless mesh yet Cat6A to either satelite gives 1/4 speed down 1/3 up

[iaincm]

I have centurylink fiber and I have configered the orbi RBR750 router to PPPoE and VLAN 201 tagging to connect directly with the fiber optic negating the old centurylink modem and router (they are totally disconnected in a box).  I get 850 download and 450Mbps upload from Orbi. Yet when I plug my laptop directly into the Orbis with a cat6A cable I get 745 and 480 on the router BUT when cabled to either satellite I get 260Mbps download and 190Mbps upload.  I thought the orbi AX 4400 WiFi 6 could communicate with each other at much higher speeds.  I have set the DNS to 1.1.1.1 and 1.0.0.1  I have selected the least trafic channel for both 2.4 and 5Ghz channel. I set the CTS/RTS threshold to max 2347 I have tried short preamble, I have disables 20/40 Mhz coexistence.UpnP on. IPv6 DNS adress to Cloudflare.MTU size optimized with ping tests no fragmentation and added 18 (1487)

why am I not getting faster speeds on my satellites.  I thought with the dedicated backhaul they could communicate upto 1200Mpbs/ sec  wirelessly.  and since I am plugging my laptop directly into the ethernet jacks of either RBS750 satellites  why the great speed drop?

[FURRYe38]

What Firmware version is currently loaded?

What is the size of your home? Sq Ft?
What is the distance between the router and 📡 satellite(s)? 30 feet or more is recommended in between RBR and RBS📡 to begin with depending upon building materials when wirelessly connected.
https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite 📡

Try enabling WMM. Under Advanced Tab/Advanced Settings/Wireless Settings

Try disabling the following and see:
Armor, Traffic Meter.

Set 20/40Mhz Coexistence to 40Mhz only. Set CTS to 2347. Under Advanced Tab/Advanced Settings/Wireless Settings