CP2 and CP3 will generally end up being the same. I'll come back to those.
CP6 is, if I remember my old DX6 correctly, the pitch range swash setting.
The first thing is to get your head set up with everything level. Then get your blade pitch set so that you have, in idle up/stunt mode with motor disconnected, 0º at center throttle stick and the same but opposite values at high and low stick, i.e., +9º and -9º, or whatever. The absolute values need to be within 1º of each other.
CP6 will increase or decrease this range. Increase the absolute value of CP6 to increase the range, i.e., to +11º and -11º, or decrease it to decrease the range, i.e., +8 and -8º. This is a matter of preference and flying style, but a good range is +10º to -10º.
CP3. Elevator travel range. From one side or the other of the heli, put the pitch gauge on a blade and make sure you're at 0º/center stick. Push the cyclic stick all the way right or left. Increase or decrease the value of CP2 until the gauge reads between 4½º - 6º positive or negative, depending on which way you pushed the stick. 4½ is a little on the tame side, while 6 is plenty aggressive enough for sport flying and mild aerobatics. You can go higher or lower depending on preference and experience.
CP2. Aileron travel range. This is done the same way as CP3, but from either the front or rear of the heli. The front, in my experience, is way easier. Go for the same pitch as CP3.
A soul in tension is learning to fly