While flying my 300x recently, i tried to up the throttle curve to 75% at mid stick and 80% at the high point. The cyclic reactions became violent.
I had to tone it down to 60% at mid and 67.5% at the hi point. Also set my D/R & Expo to 65%, +35% for Ail and Ele. 75%, +15% for Rudder.
Not as smooth as my 130x is yet, but very learn-able.