Bruce,This is really impressive!  What are you using to measure your 0-60 time?  I recently tried to measure the 0-60 time for my MR2 electric car using both an Android app called GTR (paid $3.99 for it) and an iphone app called pocket dyno.  I got 10.5 seconds for the pocket dyno but wasn't able to reproduce with the GTR app.  My build is a 144V Advance DC motor with a modified 1231C curtis controller capable of 750amp draws and 45 180ah LiFePO4 cells. 

Did you consider direct drive with the transmission removed?  Is it a 5 or 6 speed?  It always amazes me the Tesla goes without a transmission and it seems like a motor might fit where the transmission was in a BMW. 

The acceleration is much better with the transmission.  In fact, 1st gear is useless because it starts so fast.  2nd gear is best for racing and 3rd is what I usually start with.  But I've been considering removing the transmission because I'm not really racing, it would save 150 pounds, it would be even quieter and it would free up space for an iPad/iPhone to display battery details.