my springs go tight when i take the platfom over half way, as you say the shock piston doesnt go high enough, but if you keep raising the platform putting the spring under tension, the car wont compress the spring as much when the weight is on it... and you do get higher ride height, i can make mine look like an offroader


its probably knocking because you dont have enough tension on the spring, as the spring will jump about if its near its full length

its how they work, its kind of backwards to a std strut, on coilovers you push the spring up to tension it, which pushes the piston to its stop...without that you wouldnt be able to tension the spring...