A couple of questions about the Blade CP

I bought one about six weeks ago. This is my first heli. I have come a long way in six weeks. I pretty much mastered all aspects of normal flight. As I have started to attempt a few stall turns, I have been trying to go as fast as possible. I have noticed when I have full collective the head speed starts to bog down. I have it set up from the thread by bdavison. I am not sure if I have to much positive pitch. I also am not sure if the positive pitch should be the same between normal and idle up at full collective. Does anyone have a recommended RPM with a 900 Li-po, and should the head speed be constant throughout the range of the collective.

I have also noticed when in a steep banking left hand turn the motor or gyro seems to skip. I at first thought it was a radio glitch but it only happens turning sharply left.

Any thoughts would be apreciated.