I've been seeing a lot of recoil spring sets on eBay for 1911s. It looks like 16 pounds is the standard weight, but you can get them as low as 7 pounds to as high as 20 pounds. My question is, what is the reason to use different weight recoil springs? What benefits would that bring? Would different weighted springs solve, or help feeding issues? I'm talking just about 45acp here. What are your guys' thoughts?