1512 2.5D vs 3D on 5S?

[rootar]

on our track the HIGHER i geared my buggy, the lower the motor temp was (it wasnt running at full throttle in alot of places but only 3/4, and had alot of letting off due to the extra speed, but in turn the esc would be hotter, and so would my batteries and my little proteks couldnt handle the really high gearing (46 mph) but my 5s 5000 FP could but now im geared for 41 and the proteks can keep up with that and the motor never runs full throttle except on about 200 feet of the track. which is much better than 600 or so feet it would run at full throttle when geared for 35, gearing down never helped my temps..... so if the 12 is a bust gear up.