Heres me:
The base of my thumb is always on the desk with the
Carpels all on the desk.
As i normally
always have my elbow on the desk too, this is why i had so much trouble at i42
I always operate scroll wheel with my middle finger, however for tilt right, i use my index finger, and tilt left is my middle finger again, I dont use my last two fingers for anything on the mouse, checking now, i just found that when my middle finger is on the wheel i instinctively press the ring finger into the right mouse button.