Fwiw, look at the diff in motor kvs 2200 at 14.8v = 32560rpm, 2350kv => 34780rpm, using BG's gearing calc (after verifying it reproduces the 42mph on 4S for a 2200) this diff in RPM nets the 2350 Flux an additional 2.9mph mph, 44.9 vs 42.0mph for the Flux HP. I know my Flux will pull the gearing, my gps says it does. I asume 2350 will also.

If you bump HP to 5S, it runs away from a 2350 at 53mph per BG's calculator.