1. Do you have a CP or a CP+? Because my CPP had enough power with the stock motor to lift off the ground easily. If you had the original CP with the NiMh battery I can see it having some problems with the added weight of the battery. Try lowering the pitch also.

2. It sounds like you need to adjust the proportional pot. CCW to give more power to the main motor and less to the tail motor.

3. You need to have the throttle trim all the way down and the throttle at the 0 position or the 4in1 or 3in1 won't arm. Then you can add throttle trim if you wish.

4. If the tail looks like it is wagging then your gain is too high. Turn the gain pot. CCW a little at a time until it stops.

Nick