There is a local pro in my area who did not like the high KV 4 pole motor because it would tend to cause the nose to lift up and cause too much push in the chicanes.

I opted for a 3900KV 4 Pole from Novak and that's working very well for me with a 20T pinion. I originally started out with a 5.5T 2 pole motor and while I was happy with the performance, the motor thermaled on me after 4+ race days. Most folks in my area are having good luck with 6.5T 2 pole motors.

I tried out a TenShock SC211-4400KV and couldn't get that motor to last a single race day... I found out yesterday from another racer at our club that he couldn't get 1 pack through his SC211 before his motor burned up.