Find yourself an old retractable "traditional" style ballpoint pen and take the spring out of it. Cut off about 1/3 of the length of the spring.
Now take the trigger assembly apart and remove the trigger return spring and the pin that sits behind the trigger in the loop. replace both parts with ONLY the cut part of the ballpoint spring, screwing the cut end of the spring into the hole.(It should be a snug fit) If by chance it is too weak to reset the trigger consistantly, you might have to stretch the spring just a bit, or at worst, cut another spring just a bit longer.
That will remove all the grittyness from the trigger pull and reduce the pull another ten ounces or so.
If you are worried about it being to light now, don't do it. This modification may not be the best for a begining shooter who hasn't mastered the feel of his trigger. But is GREAT for someone who is comfortable with it.
If you have never pulled the trigger out of the assembly before, you will need to get a short piece of a Q-Tip stick, or a short piece of a bamboo skewer to use as a temporary pin to hold the trigger parts together while you are putting them back in the housing. then use the normal pin to push the tempooray one out once it is in place.
Ron