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It's a PITA...but go back to basics.
1. Revert the mechbox to stock...chrony it.
Change one thing at a time.
2. Change spring...chrony it and see that you're getting your old stock FPS. You might have got a bad/mislabled spring (all the Modify packages between S100 and S120 are green...only s90 and s150 are yellow and blue).
If it's all good...then start on other changes, I'd go in this order:
3. Spring guide + Nozzle...chrony
4. Cylinder
5. Piston head (I know some guys swear by those...but I don't need them and don't think it's necessary at sub M130 power)
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