What controller for 8S that has a true brake??

[jzemaxx]

Hey guys, its time to upgrade my 9920 to something a little bigger that will take at least up to 8S and will run a 4 pole Neu as I'm ordering another 1521 1.5D to run on my 3905 emaxx. The catch is it has to have a brake since I don't have a mechanical system on this truck. Right now its running an 8XL on 6S, and just doesn't have enough to break 70mph. I have tried everything and just doesn't seem to have enough torque to get it past that barrier. So I'm hoping this setup will do it. What controller would you guys suggest running? The 1521 1.5D is 1900KV with 110 max amp draw rating.