- -12-deg (or greater negativity) twist is best for hover.
- -6-deg (+/-) twist is best for fast forward flight.
- +1-deg (or greater) twist is best for autorotation.
- Independent Root and Tip Control is best for everything.
Edit
I goofed
The signs, which preceed the values, have now been corrected.
Twist is the change in the pitch of a blade when viewing from the root out to the tip. Negative is downward and positive is upward.