HW/Weihrauch Reasons for variable muscle velocity?

I could use some clarification on HFT power limits. I thought it was 12 fpe but I also see 20 fpe in different places. This would be for hunter springer class. Anyone have a definitive answer?
I'm in NC it's 20fpe for pcp or springer where I shoot. Never seen anyone shooting a 20fpe springer though, mostly 12 to 15fpe. Mine is right at 13fpe.
 
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