Juergen, not sure why you've had that problem with ride height - I just wonder if it might be related to the size of the tyre?? I don't know the size of the Proline, but I've run my car with Schumacher mini spike rear and low profile staggar rib front and have no problem getting it down to 18ish mm.
One trick you could try would be to get a different lower spring seat - I know I have in the past used the Associated B4 cup as that allows the spring to sit lower. I haven't needed to use this on the KF, but it might help you - fyi it would be K1 rear tower you'd need to change to if you wanted to lift the rear shock up, SX3 won't fit.
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Matthew White
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