Carbo, my personal setup on a fairly slippery outdoor track (clay with some sandy parts) for diffs was: rear, as per the manual (1/8 turn off of full tight) and front 1/16 turn off of full tight. My diffs were always smooth feeling or I would clean and rebuild them. They never slipped and always worked well ( I don't know if they could have been better as I didn't play too much with this setting). It could be a starting point for you for setting the diffs.
Obviously, no setup will settle the problem IF it is due to poor driving skills. But I think you know that already...
That you can only judge (I have no idea how good or bad a driver you are) for yourself and work on as possible.
Other priority items I would look into are Tire selection and wear. Slipper clutch sdjustment as a very tight slipper does exactly what you are describing. Weight distribution. Ride height adjustement. Then all the rest of the little components that will add up to better handling in those slippery conditions.
Anyways, that's how I would go about it first... Once you're certain you've done everything possible to improve your driving skill in regards to that tricky spot...
Anyways, I'm out of here.
With all due respect to the different posters who contributed to this discussion, I don't appreciate the tones being used here...
Good luck!
