Differentials on Brushless Vehicles

I have some observations and questions:
1) I am worried about the effects the power output from a brushless system will have on all of the differentials of my LSP.

2) People who race nitro truggies have problems with their differentials not holding up over time, which scares me that mine will not hold up well.

3) After running the truck for two battery chargings, the diff fluid in my center diff looked like motor oil (started off clear); this is a LSP so the diff gears are hardened.

3) Are there any differentials out there that are larger/stronger than those found in 1/8 buggies and truggies that would realistically fit on a 1/8 truggy?

4) My setup is pretty tame compared to others on here, so is anyone else having problems with their diffs? (I have a MM, 8XL, 2 trakpower 4900)
5) Do ya'lls brushless truggies wheelie, do flips?
Should mine be doing this? I am not geared real low and don't have any diffs locked.

Thanks for your responses, I always like to overbuild things, and if there is anything stronger out there, then I am up for it.