1) I’d definitely get an OAL on your .22WMR cylinder, and start searching for a .22LR with that OAL, or slightly longer. Getting a .22LR cylinder for your revolver will allow cheap practice, and a properly fitted .22LR cylinder will help remove one variable.
Sources for used cylinders include the Classifieds here (post a “WTB”), eBay, GunBroker, gun shows, gun shops (musty/dusty is better, in this instance), etc.
Fitting instructions have been posted on this forum in the past, as well as on many other forums.
Long term, you’ll be better off with the correct cylinder for .22LR. I’m a little surprised that you haven’t been splitting some of your .22LR cases, when firing them out of your .22WMR cylinder.
2) As alluded to by Neon Vernon, shooting single-actions is “different” from DA revolvers or semiautos. Your technique will almost certainly improve with further practice.
3) Are you shooting from a bench, or unsupported? Shooting from a bench should give a better idea of what the revolver is capable of, vs. where your current level of proficiency is.
There are some nice groups of holes in those targets, showing potential. There are also some rounds wandering around, and probably a few “flyers” where you knew that you did something wrong, at the time of the shot.
4) There’s always the possibility of a chamber or two being “off.” One way to test for that is to number the chambers, put up six targets, and shoot the same chamber at each target. That can reveal whether you have a problem with a chamber that’s “not quite right,” in some aspect.
That’s probably a project for further down the road, when your skills have improved somewhat.
5) “Good on you,” for having the courage to post targets. A lot of the naysayers are probably split between razzing you, and suggesting that something may be amiss.
Get a .22LR cylinder to keep practicing for cheap, and I predict good things will come your way!