AX4200 - rbr750 and two rbs750 - throughput concerns.

What are people getting interms of throughput on their orbi systems?

What I'm using 

Test setup

• For conversion, https://www.gbmb.org/gbps-to-mbs
  • 4.2GBPS = 525MB/s (theoretically)
• Internet speed tester, https://www.speedtest.net
  • wired 99% percent of speed - yes wired is always faster
  • wireless - 35-85% of speed - varies should be consistent much more
    • 3 test - 35, 64, 83.  It throttles up slowly.
• Local Area speed tester, https://www.aja.com/products/aja-system-test
  • 1GB file transfer.
• Hardware
  • 2 laptops with SSDs (less than 2 year old)
  • AC wireless - theoretical capability 1300 megabits (162.5 megabytes)
  • SMB file transfer.
• Setup
  • Router - 15 feet away from satellite 1 (no brick walls)
    • Turrned off satellite 2. 
• Test1
  • Wireless to Wireless transfer - 23 megabytes (seems very low) 

My questions:

• throughput to the internet (percentage of their maximum bandwidth)
• throughput of peer to peer wireless transfer
• How do you improve the speed and performance in AP mode?
  • settings don't really have much options.

Thanks for the help,