You didn't mention how old your revolver is, or how much it's been fired.
I second the dry-fire suggestions. My 442 trigger has smoothed out over a period of time. My girlfriend has a 642 that only has around 100 through it. The difference is night and day.
442 was purchased new on Dec. 30, so it's not even a month old. First range trip was 50 rounds of Remington UMC 125 grain fmj and 15 rounds of Hornady Critical Defense +P 110 grain FTX.
2nd range trip yesterday was 50 rounds of Remington 130 grain fmj and 5 rounds of the Hornady +P. So, only 120 rounds total. And probably an equal number of dry fires.