Hi generalg,
I'm using a 7XL on 5S with 2 speed gear with 15/49 pinion/spur. The BK 9920 is set to forward only mode with no brakes (I'm using mechanical brake). I had a 60mm fan powered direct from the 5S battery blowing across the esc before I updated to this FLM conversion. In that setup, the combo worked well. I have not had a chance to try out this new setup.
BTW, your airbrushed bodies look very cool

. I am a fan of true fire paint scheme. Do u ship to Malaysia ?
Regards,
Joe Ling