I used to play keyboards, but now ...
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Join Date: Dec 2011
Location: Glenpool, Oklahoma
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Dry fire can help. Also your Ruger is a pretty small gun, so felt recoil can be a lot stronger than with a full size gun. It's natural (but wrong) to increase how hard you are holding the gun as you pull the trigger. Tightening your other fingers at (or just before) the moment of discharge can pull the muzzle down and to one side (in your case the right).
I'm still struggling with that same problem, though I'm usually low and left. It does get better with practice. You can't hardly see yourself doing it since the recoil drives the muzzle back up and covers the pulling down action.
If you are anticipating (as I do) there's a good chance you won't see it during dry fire. You know when you dry fire that you won't be getting any recoil. So, you don't twitch. If you can get a friend at the range to load your magazine with a couple snap caps at random locations, you will see the twitch since there's no recoil to hide it. That helps with diagnosis, but it hasn't helped me with correcting the anticipation (yet).
Keep going, it will get better. By the way, if the Ruger is new, it probably is NOT the sights. Most decent handguns come pretty well adjusted. If you have a laser boresighter you can check it pretty easily.