Some of your lack of comfort might be because your eyes and muscles have forgotten info that you used to have locked down. Like shots that should look like old friends look foreign and you have no idea if you're aiming 'em right or not. Then when you miss them you're like "man my stroke must be off"
No way to know what's wrong with your stance without seeing it. Video it and post it on youtube. Here's some advice anyway.
1. Make sure your shoulder, elbow, wrist, and stick are all kind of in the same straight line. Try to look back and be aware of any kind of chicken wing (elbow sticking out or tucked elbow).
2. It will feel weird at first, but force yourself to do at least a full 1 or 2 second pause at the end of your backswing. Go back, count 1-mississippi, then forward in a nice straight line. Sometimes during the pause you can catch yourself lined up wrong or you can tell you're about to steer the shot. Don't steer anything. Watch when you go forward to see if the stick swoops sideways when you go back or forward.
3. Not everyone agrees on this one, but sometimes it helps me to concentrate on moving only the
bare minimum amount of muscles to make the shot. What I mean by that is... imagine your elbow is locked in place and totally still. When you stroke, just bring your forearm back... then swing it forward without letting that elbow drop. Basically you're cutting the shot down to only one moving part.
Some people won't like that advice, Railbird... because there's a common argument about whether people should try hard to keep their elbow still. Many pros look like they don't. But I don't want this to turn into that big argument

I'm just saying give it a try. If it helps you at all, good. If not, don't worry about it, focus on 1 and 2.