finally got my brushless

[ygguB naM]

I got my bk worrior 12020 and lehner basic 5300 for my b4 that came in just before i went to the track. After i got it setup and reved it for the first time, me and everybody elses jaws droped, on the track it had about twice the power and the same top end as a 7turn brushed on just 6cells! I have some questions though, i get cogging at low rpm so i have to role on the gas the first 1/4 of the of the trigger, it's not a big deal on my promatched 3600's but on lower mah packs, it's almost undrivable, is there anything i can do about it and will it stop on higher voltage? There's also a thread on it here http://forums.radiocontrolzone.com/s...d.php?t=221546 and i can get some pics up later.