My idea, my love, my history

[Apolan]

for inperfections in bad roads (i imagine its the same crappy roads in warsaw that we have here in slovenia) the best solution is progressive springs. since you have adjustable hight already, you might be able to squeeze in a litlle soft spring with about 4 or so flat type coils very close to each other, like they use in rally cars.. or just get new progressive springs.

For smooth racetrack the best is non-progressive but as soon as you go rallying or drive on bumpy street roads you almost need that. my friend used to race in rallies and hillclimb and he said, that when he tried non-progressive type springs, he didn't dare to push the car at all on hillclimb/tarmac rally as it was loosing grip over bumps in the road and the car was very dangerous to drive.