Polishing the innards can work well in smoothing things up, but keep in mind that this can cause grief as well, but the biggest greif is caused by the changing if springs. I think ruger springs are made as heavy as they are to keep from having to extensively smooth out the innards and still keep things functioning.
Before doing a complete take down of the trigger group, I reccomend studying things, taking a few pics, etc. Typical of ruger, it is really simple, it just looks complex, and can be confusing.
Also, tiptoe around work on the trigger and hammer themselves, be very light on them, and do not use a dremel when smoothing out mating surfaces, infact, do all the work with (try not to laugh) an emory board, they work well, and leave a smooth surface. taking too much off can be a bear, and triggers and hammers are factory fit only so it will end up with a trip to the factory to fix and major boo-boo's.
another method of polishing I like to use is to get some metal polish (like Maas or flitz) and heavy construction paper, and smear polish on the paper and work the part with the paper sitting on a hard, flat surface.
And yet another method I have had some success with...really try not to laugh guys....I use metal polish like a lube, smear everything down with it, put it all together, and dry fire till my fingers hurt......
.....Warning.... keep in mind, I am a SICK puppy, and should have been sterilized to prevent the world from being infested with people that are too stupidly self reliant to ever goto a professional.......This stuff works for me, but I am no way responsible for any ommissions in technique, etc. that may cause damage to you or your guns. I am not a professional, just a gadget junkie.