I purchased a project with ALL skin rivets that LOOK like they were back riveted. I cannot reproduce these results. My ATS gun with high pressure and throttle valve closed as much as it will, still runs fast NOT THUMP THUMP. The rivet head looks shiny ( too much hitting? ). The project I purchased, the factory head looks like it came out of the bag and the little dent looks like never struck, and transition to skin is beautiful. What am I doing wrong ? What rivet gun will do better ?