I recently went on a similar endeavor and have Bob Jones inserts +5 diopter in my service rifle sights. I also went with a fatter, USGI front sight for my service rifle as well. I have 20/15 by that doesn't mean anything when presbyopia kicks in. Before I ran a .052 front sight with a .038 aperture from when I first started shooting highpower in my late 20s. Around late 30s till now my scores started to fall and groups opened up. One of the factors was that I struggled to read objects up close - a symptom of presbyopia (hardening of the lense). A trip to the Optometrist confirmed it and I got a prescription for +5. It is also important to let the Dr. know at what distance you will be focusing on. Front sight. Now I use a USGI front sight (which I think is .072) and a .040 aperture rear. I also use Scotch tape on my glasses for my non-shooting eye which resulted in less headaches after a long match.
It is also a misconception that a smaller front sight will give you more "precision" - but think of it this way, if you struggle to see your sights how do you know where your rifle is pointing? Also, the smaller sight can get lost in the target and then your eye will focus on the object that is the easiest - which is the target and your shooting will suffer.
A sharp, clear front sight is the last thing you should see the instant before you press that trigger. Easier said than done.