I checked the rollPID numbers in the ai.cfg for the 208 and the numbers were very strange compared to the other turboprops.
The numbers in the beta 1.5.12 are rollPID = 0.1, 0.5, 0.1, 8.0, 100.0
P is very low
I is high
D is very low
For example this is the numbers for the tbm930
rollPID = 1.5, 0.1, 1.2, 8.0, 100.0
So I made small mod for myself using the numbers below:
rollPID = 1.2, 0.1, 1.0, 8, 100.0
And it fixed the roll issue.