I think I understnad what your saying.
When the sights are correctly lined up you should not be able to see the top strap at all. For our purposes it doesn't exist. There is no top strap involved with sight alignment. If you can see it you are doing it incorrectly.
What does exist, the ONLY thing that exists, alignment wise, is the relationship between your front and rear sight. I'll give a go at describing it.
The front sight should be centered in the rear sight, with the top of the front sight lined up with the top of the rear sight. Your focus should be on the front sight. The target should be blurry. The rear sight should be blurry.
That's the "classic" sight alignment you want every time.
Once you achieve it, the trigger comes into play.
For the record, at this stage of the game I'd leave your front sight alone. (It looks fine.) I'd wager that once you perfect your alignment technique, work on trigger control, and figure out which load it prefers that you'll find that revolver more accurate than most shooters.
Best - Erik