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I am running a blade cp with brushless separates. The main is a thunerbird 18 with the eflite 370. The tail is a thunderbird 9 with GY401 and medusa motor. I have developed a tail wag that has gotten to be uncontrollable. I have changed the tail esc and the 401, with no change. The gain adjustment has little to no affect. At times the tail will quit altogether. I did notice last night that there seems to be quite a draw on the system when other inputs are entered. In other words, with more tail rotor rpm, the heli drops, and with any great swashplate command, the heli drops. I'm starting to suspect the main motor going and not the tail motor. I have run the tail motor and the tail esc minus the gyro on the bench and it seems to work fine. I read somewhere that a brushless will pulse before it fails. Maybe the tail is just chasing the main motor pulsing.