I'm looking to revamp my rear suspension. Currently I have stock springs and 4 inch blocks out back. I have some things in mind for longer shock mounts, but I cant decide what to do with the springs. The stock K30 springs are really stiff, and I don't utilize their payload abilites. I'm thinking of getting some 4 inch lift rear springs, with custom shock mounts and calling it good. But I'd like to know how something like a TC 56 incher compares to a stock K30 spring as far as ride quality. If there isn't much difference, I might as well just go with a shackle flip (because it's cheap). Or, the best method, go with a semi-custom spring, since they are the best riding and flexing option. How much does a set of custom rear springs cost for lifts in the 4-6 inch range?