Don't use the Dremel! Get some Flitz and put a dab on the sear. Making sure that the hammer does not hit the front of the receiver by using something such as a strip of leather or foam, repeatedly cock and fire the FCG several times. Then dis-assemble the FCG and completely clean it. Per J-P's instructions, I then used a 60% Moly paste lightly applied to the sear area. My 15-22 had a crappy trigger before and now it's MUCH better, so much so that I'm not going to buy a replacement FCG for it.
Hobie