The way I read your question Mike, was you are aiming point blank at your 50 or 100 yard target and your sights are covering up your target, so you are unable to accurately shoot at that range.

If you shoot with both eyes open you can accomplish what you're trying to do but I think accuracy would suffer a little but the grouping would be a whole lot better than if shooting with one eye closed. For target shooting you need to take a 6 o'clock hold and you shouldn't have a problem, whether shooting with one eye or both eyes.

If your front sight is inter-changeable then you could have a gunsmith such as Dave Clements make you up a thinner front sight and you can always open up your rear sight if you feel there is a need to do so.