You can run stock parts at 25rps no issue.
Shouldn't need to swiss cheese the piston or anything. I'm running 25rps with a system supercore piston, and that's a HEAVY reinforced piston.
Have you considered using a lighter spring as well?
If you use a heavy spring, there's too much inertia built up in a light gearset when the sector let's go of the piston and the gears shoot back around too quickly. So use of a lighter spring better regulates their speed.
I use a very heavy prometheus gearset, so they're much less prone to rapid acceleration from that built up inertia
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