An inportant fact is he is running on DIRT! The tires will spin long before the clutches slip. The amount of stagger you need to run varies depending on the banking of the track, if any, the radius of the turns, your driving style.
I would try at least two different size tires on the outside wheel or the inside wheel and compare the differences in how the car handles.
When I ran a car on a local oval track, but on pavement, not dirt, we ran huge stagger. But this track you never went straight, it was that small.
"Drag racing is for those people who don't know how to down shift and brake at the same time. "
DD '12 VW Jetta TDI, Race car '87 ITA 16V Scriocco
Cars owned: '86 Mustang GT, '92 Mustang LX, '93 Mustang Cobra "R" #58