I figure you're just giving him a hard time but I rarely shoot 5.56x45 over 25yds myself. It would be a waste for me. If I ever find myself in a possition that I need to use my rifle it would be closer to that range. If the intended target is at 100 or more chances are I'll just keep moving. Now the 300blk is a different story.
I pulled out a set of Magpul MBUS and they are offset quite a bit as well. The rear hole is much higher than the front post. Sounds like you'll be ok like Cane mentioned.
I have never taken the time to look. Thanks for bringing this to our attention.
Edit: try moving your rear sight further rearward for a longer sight radious. Plus it looks better