I put a new set of Meprolight night sights on a Glock 19 and the gun shoots high with 147 gr. (mm ammo. It shoots dead on with 124 Plus P Gold Dots, however I have quite alot of HST 147 and I like the heavier bullet. What can I do? Are there different size Mepro front sights? The markings on my front sight is, "MH3" .