I think that speaks volumes lol. Exactly the same bandwidth but you go from A+ to D for quality?! Did the preemptive test give you exactly 0% packet loss?
Firmware is now @ 1.03.6g running on rb-951g-2hnd.
This is with preemtive
This is with reactive
No settings changed between tests.
Weird how upgrading seems to have helped though. Now that you're back on the current firmware, I'd suggest totally avoiding reactive or unticking share excess because they always give me problems on 1.03.6.