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I'm at 500# springs now and it turns in so good I hate to tamper with it, but my front shocks are on full stiff to control the diagonal weight transfer so I feel like I could be sprung somewhat stiffer.
600's was my prospective change but I didn't want to over spring it and develop a push.
If you were able to pull off 800's I feel a little better about springing up to 600's, especially now that I'm going up in tire size.
I think with a sticky tire, 600 lbs in the front is as low a spring rate as I would choose. I run 550 front spring rate with a 35mm Strano front bar set to full stiff and a 350 rear rate with an 18 mm bar and probably would benefit from increasing the front spring rate. As you can see below, my car has a lot of body roll mid-corner and might not be in the most effective part of the camber curve.