I like the front post to fill that little notch, making a flat plan with a brass center, then a 6 O'clock hold. . .so something like
Yup, I get that, same as I do. You could paint a little circle right on top of that yellow square and that's where it'll hit, like a ball sitting on a square block. I like a front blade just wide enough to fill the rear notch from side to side, not too skinny where I have to center the gaps, not to wide where ya have to look for the edge.
What I found with aging eyes is it's all about the light and how it hit's your eye through that sight picture.
In the field and/or on the range for a full day, the light changes during the day, the sun moves, right? Over-cast, partial sun, those big dark fluffy drifting clouds,,
I've given myself the ability to change with that, hear me out.
First off, mask-off and paint that nice clean an pretty top flat of the barrel, ya know the barrel that looks so nice after cleaning,, light reflects off the top flat,, all the way along your sight picture.
I use a rattle can of flat black, cheap stuff, when I want it gone, brake cleaner on a soft cloth wipes it off. Heck, a proper cared for barrel has a light oil coating to begin with,, it ain't nothin permanent at all, it's just there to stop reflection an glare.
Sorry Sean, it's late now an I'm tired,, there's some more tricks I've gleaned from others that work well too,, I'll share later
Good luck friend.
but anyway, here is a look at the last few shots and the target. 
Once I'm sure the sights and load are in order I won't be shooting from the bench any more. I'll shoot sitting or kneeling or standing to get ready for hunting.
