RE: crooked takeoffs
The real truth to doing a take-off is that you should be using all four basic controls. While certain techniques depend on landing gear configuration, most factors are universal.
Rudder - to hold the heading on the runway
Elevator - to control when you leave the runway
Ailerons - to compensate for cross winds on the runway
Throttle - to control acceleration
Until you can do the above, you may have experience, but not be an experienced pilot.
As far as changing spring rates on the gimbals, yes that can be done. But are you flying with your thumbs only or pinching the sticks between the thumb and first finger. For myself, I find it somewhat easier to avoid cross controlling with the pinch method.