The biggest thing that improved all aspects of ground handling (taxi and t/o roll) in the TBM for me, was setting "stability augmentation" on the yaw axis, completely off. I'd turned it on, assuming it would settle things down, but now understand the TBM was coded specifically for this value to be off. With it off, and by following these tips, I no longer have any issues; ground control is now perfect (and believe me, when I first tried the plane, it was absolutely awful!)
- Rudder trim MUST be set, but not as far as the green area; about half way between neutral and the green area.
- Calibrate your rudder pedals axis in your controller profile, before EVERY flight.
- Introduce power very steadily on the take off roll (I usually take off with 85-90% torque).
.....another optional tip that can settle the TBM's control sensitivity down, is to carry extra fuel.