5 cell + mamba 25 in a tenth scale for racing?

I have seen a mamba 25 with a heat-sink epoxyed on the fets, looks easy just don't know what epoxy to use.
-do the numbers on the motor look reasonable? little airflow in truck compared to airplane, but not looking for monster power, just quick, smooth, and light.
-recomendations for a small light bec?-(so far found atlanta hobby park bec 6.5g (.23 oz.) 6v 1.25 amp cont. 1.5 amp 60 sec.?

-looking for more opinions on higher voltage being smoother? A high kv speed 400 size motor geared down on 3700mah two cells with my M.M. is an easy way to knock of some weight and safer, but then eventual monster/truggy/buggy will be stuck on 4 cell. 2-cell is lighter and cheaper than equal watt/hr 5s. mamba 25 ofsets extra battery weight compared to M.M. + balances out very well in touring car

I dont believe the mamba 25 has thermal protection, but I know how to use a temp gun, as long as it does'nt light off the first time I squeze the trigger. don't want to waste money on a motor and small bec if this is a totaly unusable idea.
I do have a couple old 10c t.p. 2100 packs one 2s and one 3s laying around to test with and the mamba 25.
thinking slightly smaller mah 20c pack if it became permanent. eventual truggy could use 2p for 5min heats add parrallel packs as needed to make the main normaly 10min. around here ocasionaly 30min.