Sidearms & Scatterguns Spring Weight Glock 20

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I have always used factory springs and guide rods (17lb). Seems this Glock 20 with heavy 10mm is slamming the slide back hard! My shells get kicked out 10+ feet. Spring must be whore out. Maybe it's time for a new spring. Has any of you changed the weight on your 20? I'm thinking of going to a 20lb. Thoughts?