I've met with the following situation: upgraded from nstreme to NV2 (with N) a sector. MIMO, with half of users 1x1 (groove/711), nearby 2x2 with SXTs.
With Nstreme (clients in station pseudobridge), everything was nice.
After switching to NV2, all the clients have to be switched to station bridge.
Sadly CCQ decreased a lot (~from 80-90% to ~50-60%) and the customer routers cannot gain the speed what they had, even if the btest/tcp to their SXT showed much higher speed. I also had a situation with another sector, another city (but single chain AP) - reverting back to nstreme solved.
the AP, and clients all 5.23. Noone has wronger signal, than about -72. Not so much noise on channel.
Any helps would be welcome!