David, if you set the car with a 4" ride height, how much droop do you have front and rear?
If the front has as much travel as mine did originally, watch out of the ball joints necking on full droop. Mine was limited by the ball joints, not the travel of the dampers, which is bad news. I've solved it now, by buying different length front and rear dampers.
You might find fitting some polyurethane bumpstops is helpful - allow some movement using just the spring, then increase the effective spring rate of the suspension by compressing a bumpstop as the suspension continues into the bump stroke. Again this is what I've done on mine to give initial compliance, which firms up with travel.
My car is about 140mm at the front, 150mm at the rear, and even this is marginal on the road. I have 300 lb front springs, 350 lb rear springs, and although my suspension arms are different to yours, I would be surprised if the movement ratio is massively different.
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