I just used pedders camber adjustment bolts, no problems with them, also tried a few different coilovers over the years, Tein and BC Coilovers are right up there among the better ones, also MCA coilovers, only thing is they seem to be getting way more expensive from when first coming out.
Just remember with coilovers, you only get what you pay for sadly, I ended up using Eibach springs in the end on mine.
The spring rate and ride height all depends on your vehicles weight, many coilovers allow you to do this in two ways compressing/uncompressing spring by way of adjustment nut at spring seat which will alter preload—or by threading the shock's base up or down—which will alter shock travel, just about finding which setting works for ou I guess.