I dont suppose you've tried that same motor in your maxx yet by any chance, with the same batts? Im really having issues deciding between a 1600 or 2000kv 80mm motor for my truck; I could get the 2000 and gear it down, but I'd still be a little concerned about a motor that fast (on 5s) running a bit hot and needing cooling down brakes still. If I opted for the 1600kv, it would run cooler for sure on 5s, but according to my calculations I would struggle to see ~40mph without running something like 24/56 gearing, though tire balloonage (love them jumbo clawdawgs!) would help abit.
'Tis a tricky one....
