Understandable, i've ji've tried to help far too many people that will not change one thing at a time looking for grip and they sometimes miss a setting that works.
track looks great, a real challenge with a 2WD buggy i bet, i'm surprised yellow minipins are the control tyre for that surface, must make it very difficult for all 2wd racers... must have to use fairly slow motors and lots of throttle contol to get anywhere in the right direction!
I'm not sure that a geared diff will help unless you use very light oils, maybe 1K to start with on a low traction surface
my gear diff in my mid car took away some of the steering which was good because it is used on high grip tracks... but haven't tried gear diff in the rear car, it is barely used, so couldn't comment.
On that surface you would want quite a loose ball diff anyway to help traction when turning.
Maybe more rear toe in would help it generate grip under power, negative camber will keep the car more stable in a straight line but as you don't have grip from tyres it won't roll in corners so you may lose traction because of it.
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