Setting up coilovers - any tips?

[broken biscuit]

I have bought some budget (Tecknik) coilovers from ebay for my e46 328 bmw, as the shocks all round were soggy, two were blown and it handled like a blamange.

Despite measuring both rear height adjusters on the springs, and ensuring they were equal, the car sits 20mm higher on one side than the other. I will double check the springs have seated correctly, but if so, why would they not be sat level?

The fronts are yet to be fitted, due to running out of light tonight. They have the obvious height adjustment on the springs, but also some secondary adjustment on the bottom of the shocks where it slides into the hub. How do I go about setting them up correctly? I can play with ride height easily, just want a reasonable starting point. also, I assume I use all the original top mounts, washers etc etc?

[broken biscuit]

Thanks guys. I have driven around 15 miles today and the car has settled level. My plan is to get new tyres organised, then get the front coilovers fitted and set up by a mate who is a BDC Drift driver, and sets up his drift Skyline so knows what he is doing. Once the heights are all sorted and look right, and any necessary spacers etc are fitted, I will get a 4 wheel alignment done, and then will have a decent handling/looking car.