There are lots of important things in a setup apart from ride height and springs. Tyres are 90% of any setup.
As far as the suspension settings go, buggy geometry is designed around bumps and jumps. The geometry "works" when the front wishbones are around level and when the rear driveshafts are around level. If you slam the car low, you get the CG down low (which is good) but you also make the roll centre a lot lower (which will increase the tendency to roll). Stiffer springs will compensate for that lower CG a little.
But slamming the car low also means that the shocks have even more droop. This is good for bumps and jumps but unnecessary for a completely flat track. More droop also encourages grip roll.
First way to approach the grip roll problem is tyre choice. If you have too much front end, use a tyre with less grip.
With suspension settings, either run the car on a conventional off-road setup, or if you want to slam it low and run stiff springs, decrease the shock length as well to get rid of the droop you don't need. It might require a lot of shock rebuilds to get the right settings but a car with a lower CG is going to be quicker once you get it sorted.
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