1+ on the shooting. Good work.
In general, yes, the finer the sights, the finer the hold and the more precise you shooting, BUT only if you can still see the front sight, clearly and distinctly against the target. That front sight is everything. You reach a point with the front sight where going smaller and/or thinner actually makes it harder to see against the target and that works against you. Try switching colors and sizes and see what works best for you.
If you're old like me and darn near blind as a bat, you can't make the front sights big enough.
That's why I shoot a red dot on my Hunter so much better than I shoot iron. When I'm having trouble seeing the red dot, I just turn up the brightness.