I'm not sure what you people expect or can accomplish with your 15-22s. If you look at the original 22AR test from American Rifleman magazine, while the Ruger SR-22 and Remington 597 VTR both shot better than any of the other guns in the test it was not by that much. The AR15-22's accuracy bested several of the so called all metal guns. And Shooting Times picked it as the most AR like of the ones they tested in an article with comparable accuracy.
Yes I have a PC model and I also have a Rem 597 VTR that has a VQ barrel and Jard trigger. And yes the 597 is a true tack driver being able to shoot .1" groups at 25 off the rest and .3" at 50. But I did not buy either gun to shoot little holes in paper, but instead to bang steel plates as fast as possible out to maybe 35 yards. At that the 15-22 is superb. And to make that happen at the highest level I have poured some extra $$$ in the gun also. Not quite as expensive as the 597 VTR sits ($1000) but close ($900). And for every 50 rounds I shoot out of the 597 I put close to 1000 downrange with the 15-22. The only steel the 597 gets to shoot is Metallic Silhouette.
This weekend is the 14th annual PSA Shootout, one of the biggest steel competitions in the US. A centerfire pistol competition composed of 6 stages of 25-35 steel targets each of just about any type there is from sliders, poppers, plate racks, Texas stars, moving targets, you name it. This year' side match is a rimfire one. 70 steel targets with a 90 second max time and a 5 second penalty for everyone still standing. Pistol or rifle, open or iron sights, or 2 man teams of one rifle and one pistol. Max 25 rounds per mag rifle and 10 pistol. Targets are from 8-25 yards and from 1.5" Olympic biathalon to 8" steel plates. $5 per run or 3 for $10. I am shooting the centerfire part in the Sunday AM shift but I will likely shoot the rimfire match both today and Sunday PM.
Compared to this shooting paper is like watching paint dry (except for USPSA, IDPA, and 3-gun matches).
By the way the primary sponsor of the PSA Shootout is Smith and Wesson.