Maybe you just need to run your motor on more volts, to get the speed you need. Get a controller that goes from 36 to 72v, and then start experimenting.
Not too strong a controller though so you don't fry your current motor, perhaps this one. http://www.ebikes.ca/shop/ebike-parts/controllers/c7225-nc.html
It could also be paired with a cycleanalyst, allowing you to also control max amps, if your motor starts heating up too much, turn amps down.
Note the controller runs sensored and sensorless. Yes, brushless motors can run without the halls, but sensored operation is best.