TL, I was under my car yesterday and had a look at the rear springs - 12" 250lb. If I back off the compression setting on my QA1s, it gets bouncy very quickly. Tighten it up a notch or two and it goes rock hard. It's almost like the damper has too much control over the spring rate, so I'm toying with going to 300lb.
I have another issue where the left hand rear side of the car is 35mm higher than the right, as measured vertically through the centre of the axle to the underside of the wheel arch - similar measurements across the rear-most point of the doors also. The coil spring retainers are wound up equally on both sides (30mm from the start of the shocker "thread") and the front end is pretty much even. To have such a difference is a bit of a concern so I'm going to swap the coilovers/springs and hopefully this will show me whether the springs are evenly rated. I don't want to wind one side up further than the other for obvious reasons. This is assuming my chassis is true and square.
Fun and games!