Zen, I can't help you on the 944 IRS. Maybe you already have, but I would suggest you upsize the torsion bars to get back some stiffness from lowering. The 24.5mm bar from the 944T worked well in my 70 bug (26 9/16" bar).
As I recall, I had the bottom of my spring plate just below the spring plate stop when all was unloaded. That got me close, but as the springs settled, one side needed tweeking to level it out. Now, I'm going with adjustable spring plates to dial in the cross weights without having to tear it apart for each adjustment.
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