I have the 10s2p packs and they are fine, seen guys do the shows on them, gettting between 12-15mins on each pack, drawing a max of 42amps on a 20x11e prop. don't forget that the lower weight also means you can go down a prop size reducing the current drawn.
This is with the hacker C50 and opto 90 esc.

The impact also looks alot like the lorenz rhapsody.