Scirocco is kind of correct. The wishbones need to be flat when driving. There are some very technical discussions about it on other forums (specifically for my2 golfs) sonething about scrub radius, and other geeky stuff.
I made the mistake on my mk2 of swopping from a fixed rate kit
to a coilover, both weitec. It ruined the handling. It was too low. On any bumpy Derbyshire road I was slower with the coils. Bump bump smash. Wound Back up to flat wishbones and it got a lot better. More compliant and supple. The thing is winding up puts more preload on the springs, and made it too bouncy.
Lesson learnt for mk4. Il be going with sachs OE springs, eibach at push. Bilstein OE dampers. OE/TT Lemforder bushes and whiteline RARB.