Is this lipo combo sufficient?

Hey guys, i have a Hyperion 4200mah 35c 3s lipo sitting here brand new. I was thinking of going and getting a 2s 4200mah 35c pack to run along with it to have 5s in my flux. I know the minimum the Castle ESC likes is 125 amps, and that this combo provides 147 amps. The only reason i worry is that ususally its recommended to run 5000mah and 30c at least to be sure you have enough juice to run the truck. Basically im looking for a little reassurance before i go and purchase something. thanks in advance fellas.