What suits the 1930/5 turn motor?

[captain harlock]

Hi. Need some help finding the best controller to go with my 1930/5 motor( I bought it 6 months ago) which I will be using it in my B4 buggy at 16.8 volts with 10.8:1 FDR. I think the 9920 is very good, but a more powerful controller would do the job even better. I know that 14 cells is quite an overkill to the car and the motor, but I'm looking for speed records and I've been dreaming of hitting the 80s( in miles, that is). If I was able to get myself a 4 cells lithium pack with 10000 mah capacity from Thunder Power, then the job would've been pretty easy to feed the motor with hi amperage rate, but lithium costs money and I dont have enough to get them. So any suggestions? Just focus on the controller for now.:) thanks beforhand.