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LEM conversion problem?

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I have an old style USP 40(now 10mm) I converted to LEM. I have had many LEM HKs before and currently. I knew i had the old style USP so i bought the LEM kit and the extra parts needed. My only concern is, if i do not rack the slide nearly 100% it does not "precock" the hammer. I have not shot it yet, so no clue it during live fire will be an issue. Didnt know if anyone has ever seen or heard this before. Any experience or thoughts would be appreciated. Thank you.
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Had the same issue on my 94 USP .40. Ended up replacing the trigger with a match trigger, trigger bar, and also the new style hammer strut. I noticed that if i pushed down on the back of the slide when it went all the way back it would lock the hammer in place, if i raised it up (just the little bit of play in the slide) it would not push the hammer far enough back to pre-cock it. Shooting was never an issue due to the velocity of the slide sending the hammer back hard enough.

After replacing those parts i had no issues that i can recall. and after about 500 rounds or so i have had zero issues. Unfortunately i had to replace EVERY piece of the trigger assembly with the exception of the pins that hold it in the frame lol.
 

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I'm having this exact issue with my AK dated custom combat. If I push down ever so slightly when working the slide it fully cocks. If I don't intentionally push down it doesn't. Tried firing it and it cocks every time that way but there's obviously something amiss here that I'm missing.
 
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