Cool, thanks for the advice
I do need to find out how much it was the tire width that contributed to the grip, and how much the cut tire profile - I used a similar cut profile on the rear of my TRF201 and the increase in bite (mainly forward traction) was huge! Perhaps I can make drive wide uncut vs. wide cut tires to get an impression of the differences just that gives.
As for the diff, I'll keep it in mind if I try it out. To be honest though, so far on all test runs I don't recall a lot of off-power running
To be serious though, I really can't use less off-power steering: It's already a bit pushy turning into corners.