Larry,

I bought the Dx6 for my T-Rex SE and had originally installed the S75s but these servos aren't fast enough nor do they have enough torque. That may explain your problem with the responsiveness to your T-Rex. Also, I didn't change anything to the default settings for CPPM and stayed at 60 for all 3 servos on the cyclic. This seems to have worked well for me so far.

I upgraded my servos to HS65s which were about 25 bucks each. But they are definitely worth it. Also, I bought the 9650 digital servo for the GY401 gyro. This setup is extremely stable for me and I can almost hover without touching the controls. I would recommend getting better servos for the cyclic. My Blade CP runs on the S75s and that machine is a much more difficult heli to control as opposed to my T-Rex.

I hope that helps.

Joe