Well I guess we could always buy that DPM aftermarket recoil spring
system. That uses a 3 spring system, you can also change out the regular recoil spring with that using Wolf 11,13,15# and so on. Of course since it is 3 springs I"m sure that if you reload you may have to use a stronger or lighter one than what others use since it does use 3. At least that would make sense assuming that it works very well. I haven't researched it enough though, just copied and pasted a few things in my M&P Accessories word doc.