Try using a 60% moly paste on the sear group. J-P recommends using Rydol, which is a high pressure lubricant, IIRC.
I have used the J-P springs on both my 15-22's and have had zero issues, and the triggers are much better.
Now, if you want to have a bit better set-up, try this:
Pre-travel set screw
but use it at your own risk. I'm using it on my little friends and have zero issues safety and functionality wise, but you are messing with the FCG.
I like the feel.
Hobie