I read many posts, where people expressed that they prefer lower 1/3 co-witness better than absolute co-witness thanks to cleaner sight and less clutter. After I installed my own red dot sight with a fixed front sight and a Magpul rear sight, lower 1/3 does look better than absolute in my mind. The only difference is an additional pad to raise the height of the red dot sight.
Maybe you compared these two settings before? I hope to know other folks' opinion about it as well.