I ordered another LEM kit for my wife’s USPc 9mm and it had a light spring in the kit so I put in my 45 tactical to check it out and it barely scratched the primmer.
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When you say Light LEM spring, I assume you meant Light TRS. If that's the case, your 45 Tactical has a Match trigger (and Match TRS) so why are you replacing the Match TRS with that spring?
The long HS is for the USP/USPc/HK45 and the short one is for HK45c only. Being too short to fit the USP, that's why you're getting light strikes.
Again, your Match HS is the lightest HS there is.
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