Just a note on your remark about jams with you first few rounds. You might try running a dry swab through the barrel before you start shooting to clean out the oil residue. That may help.
I tried just about everything, including being sure that there was no "wet" lube at all, going to a dry lube. I spoke to a number of people who had seen the problem, and all agreed that there was no "good" reason for this sort of nonsense, but shooting about 100 rounds always took care of the problem.
I know that this will sound terrible, but I wound up giving that Ruger a thourough cleaning about twice a year (of course, I would give it a wipe down, and check for lube and wear on critical contact points ever time I'd shoot).
That just seems to be the way this gun is "happiest."
Mark