Feigao heat problems.

[Kyosho]

First thing i need to clear up. I know feigaos arent great, i know i should get a new motor, i know, i know, i know.
Now, In my CRT i run a feigao 10xl, MMM, 5s zippy, 11/46, and diffs 43/13. and my tires are 5.6in without ballooning.
temps within 7-10mins are:
Motor-140* 145* F
ESC- fan turns on at this point or it also hit 165* on me.
Batts at this time-86*F
So on Beat your truck i was informed that i may be under geared, so i had a 14t pinion laying around so i tryied it.
temps after 5-7mins:
every thing the same give or take a degree or two, but it heated up faster.
With 11/46 its geared for 38MPH
14/46- 48MPH
I cant gear any lower because the mounting slots stop and the motor cant move over any farther.
any sugestions?
and when i get a new motor i want around 38MPH on 5s, so i would get like a 1600kv motor. but i cant get a motor that is any wider than the feigao because it will hit the center diff out put, so i would have to get a medusa 80mm 1600kv motor, geared 12/46