The fourth thing you can do, replace the steel wheels with the Vintage 190 aluminum wheels. The 4.5' that we use up front have a slightly deeper offset, that'll push the tire in. They are also about 12lbs lighter each.
https://www.vintagemotorcarsin...product/vintage-190/
You will also need longer studs with these wheels.
I can still get the front right tire to rub in very hard left handers with a bump and a passenger, but the roads I drive are very twisty and not the smoothest.
BTW, I also have a Seduction Spyder. Where are you located?