I have a gen 5 Glock 45 that I put a zaffiri precision (spelling is probably wrong) slide and ported barrel on. I wanted to use irons so I put trijicon tough and bright sights on it and it shoots about 3 feet low at 25 yards. My shooting sucks so I had multiple other people who are decent to pretty good with a handgun shoot this thing and they all had the same results. What can I do to make the gun hit where I aim? Or do I just suck?