The generally accepted wireless settings based on feedback from this site are:
Wireless 2.4 GHz Professional
Turbo QAM - Disable (Only helps with clients that support it and there are not very many)
Airtime Fairness - Disable (causes connectivity issues for various devices, including wireless printers)
Multi-User MIMO - Disable (not an option on all models)
Explicit Beamforming - Disable (non-standard, might cause compatibility issues with some clients)
Universal Beamforming - Disable (non-standard, might cause compatibility issues with some clients)
Wireless 5 GHz Professional
Airtime Fairness - Disable
Multi-User MIMO - Disable (
FWIW I got better 5 GHz speeds with MU-MIMO disabled)
Universal Beamforming - Disable (non-standard, might cause compatibility issues with some clients)