This is probably the poorest way to handle whatever it is you're trying to do.
Taller sidewalls ride softer. Cheap tires ride softer.
Can I have your stuff after you crash and die? This plan es no bueno.
Go to Rock Auto and look up the shocks, and they'll be described in terms of ride quality, and that's probably the best price while you're there. Leave them tires be; you need traction. That's like, y'know, like kinda like, y'know....important.