I have the logitech 2100t, with a 9650 on the tail and love it!

Fortunately I do not get any wag when bumping up the throttle, and agree that your throttle and pitch curves may need to be adjusted/better matched.

For example, my curves are;

low middle high
Th 0 --- 45 --- 65 --- 85 --- 100
Pi 45 --- 58 --- 70 --- 85 --- 95

I have -4 pitch at low stick, 2 at mid-stick, and 10 at high stick. As you can see I have a 5 point curve in my Futaba 6exh, not sure which transmitter you have and if you have not already check out Finless' videos over on Helifreak.com (great educational resource to learn all about helis and setting them up). You could go into your radio settings for normal Throttle and see what your settings are and bump them upward to get more headspeed. Go into the normal Pitch menu and see what your settings are at, lowering the last point will reduce pitch.

Let us know.