With the money I have in the 4 inch pattern setup im stuck with crap tires. 14 inch. Might source a set of 15 inch wheels but even those have a poor selection for performance rubber...
The smoothest riding rubber for me has been the all-season M&S rated 14" tires.
My car is 5 on 4 pattern as well.
If I was to start over maybe I'd do different. But now its too much of a hassle. I've even thought about further committing to SBP with some really nice rims that look more like Torque thrusts or minlites.