I just bought a Glock 23 Gen 4 and I've run probably 750 round through it. I have two problems that are occurring. First is that I am firing left....always. I looked it up and found that I might not be using enough finger on the trigger but alas 200 more rounds with more finger and I still have the same problem. Secondly I am getting a worn spot on my thump right at the base of it. So my question is really one...what am I doing wrong with my grip?