If its bogging down with tcs that’s a driver issue not a tuning issue. But softening the rear and or stiffening the front springs and lowering the rear rebound and ride height may help a tiny bit.
Like ptg said tcs can make a bad tune into a fast tune as tcs pretty much lets you punch the throttle as hard as you want and get away with it most of the time. However if tcs is bogging the car down you need to exercise some throttle control and or get the car pointed straighter sooner to prevent the bogging as bogging down obviously ruins your exit speed which really hurts your times.
+1 probably more driving than tune.
I would run a diff max 40% on front and 20% rear.
Suggestions said already are all good advice.
To stop wheel sliding a stiff front and a soft rear will fix it. Normally I leave softer springs on the front than rear and then a stiffer from ARB to rear. However if you stiffen the front to much you’ll lose turn in and the rate of correctional turn in.