Going Heavy with a Glock 20 - which spring?

[Warhammer4k]

Has anyone set up a Glock 20 to handle extra-heavy reloads? I have a whole pile of 220 gr. plated bullets that work fine in my other 10mm guns, but cause misfeeds - regardless of powder, OAL, muzzle velocity, etc. - in my Glock 20. The only solution I haven't tried yet is use of a heavier-than-stock recoil spring.

At minimum, I have to buy an aftermarket, metal guide rod like the ones offered by Wolff Gunsprings, Lone Wolf Distributors, et al.

For springs, I'm thinking about the Wolff Gunsprings "Calibration Pack," which includes stock (17), 19, 20, and 22 lb. springs.

I could just buy one spring, but I don't want to guess wrong and end up having to buy another two, or even three springs separately later, with the added expense & delay that would entail.

Is there any use for the recoil springs I end up not using? I assume I'll find that one of the heavier springs will solve my problem, at which point I won't need the others.