The front sight is dovetailed.
That means it could be off. The rear sight is screwed to the barrel IIRC. If I am wrong about this, please forgive.
I'd make sure the front sight was right before adjusting the rear sight. Might just be misadjusting the rear to make up for a problem up on the foc'sle.
My reading of history convinces me that most bad government results from too much government. Thomas Jefferson