Good to hear cut your blades to increase the head speed, you have just scratched the surface though. I see in your linked thread you estimate a head speed of 2000. I'm afraid its unlikely to be more 1500rpm with your current setup. I am just cracking 1700rpm (tacho-ed) with severely cut blades (see pic). it is now one of the most responsive FP micro helis I've flown, not perfect but a long way from stock.