[fred cook]

If it is the original Hi-Power front sight, it is probably shooting high as the stock HP front sights are quite small and the adjustable rear sight is most likely taller than the original. So, as said earlier, if it is shooting "high" then it needs a taller front sight. If it was my gun, I would have a gunsmith cut a proper dovetail and fit the correct height sight. I don't understand why the gun is shooting even higher when the rear sight is adjusted down?? The standard rule of thumb is rear sight, adjust down to lower bullet strike and up to raise it. On the front, a taller front sight will lower the strike and a shorter one will raise the strike. Good luck with your project!