Exactly what parts have you changed? Just hammer, grip safety, and sear spring?
If that's all, then IMHO the most likely culprit is the grip safety. The "new" one may not be allowing the trigger to travel as far back (aft) as the original. What I would do is change only ONE part at a time, test, and evaluate. For starters, keep the "new" hammer and sear spring, and replace the original grip safety. See what happens.
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