My super had a slight lean to one side which turned out to be the front anti-sway bar.
On the early cars, the sway bar has a cylindrical rubber bush pressed onto either end - which is a press fit inside the drop link. then the drop link curves around under the closest spring pan bolt and mounts between two conical rubber bushes on the extended shaft of that bolt.
On mine - both the cylindrical bushes had chewed out (probably because the drop links were installed on the wrong sides - they have a slight lean to them, and should lean in towards the center of the car when bolted to the spring pan)
On one side, the sway bar had pulled out of it's cylindrical bush - and was pushing down on the top of the drop link - applying just a little upwards body movement on that side of the car. To look at, you'd think it would flop about once it came loose - but it sat there determinedly.
Mine has stock springs (but I haven't measured them), with 10mm spacers between the spring pans and the A-Arms, and runs on Koni yellows - which are a lot softer on default setting than I thought they'd be. Perhaps it's more the rebound where there's a marked difference.
I'll take a pic of the front arch height above the wheel for you Derek if that helps with your deliberations any
Personally I think it could go a smidge lower again so the arch is evenly spaced around the wheel all the way around. (but that will involve cutting springs, or larger spacers on the arms..) I wanted to let it settle after a few weeks of daily driving before I touched it again.
Oh - standard steel/rubber mounts under springs in pan - but no other spacers fitted. I wonder what the weight diff. is between the 2L and the 1600 too ....