You donít want the recoil spring too light. The recoil spring protects the gun. If itís too light you can break locking blocks or worse, crack a slide or frame. The same can happen with a recoil spring thatís been used too long and has worn out.
Something else Iíll mention but I donít have much knowledge about - when Glock first released the 17L the barrels were ported. The ports were different than your 17c but they also provided compensation. Competitors were loading 9mm to make major which proved to be too much for the ported barrels, many cracked.
While I think with the design difference and shorter barrel of your 17c would prevent that from happening with major loads, I donít have the knowledge to back that up. Itís something you may want to research.
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