If I understand you correctly, you're lowering your anchor on your face, correct? That increases the split-vision gap, if you shoot that way, but the brain quickly compensates.
The bigger advantage, I think, is It also lowers your drawing arm, bringing it more in line, and for some reason, makes it a little easier to get the back muscles involved. Both of those things contribute to a cleaner release. That, in turn, contributes to greater accuracy. At least that's my interpretation. Good that it works for you.