Howdy seanfidheall,
That's a fine shootin' iron ya got there, I have four of them myself
![Smiley :)](https://www.cascity.com/forumhall/Smileys/cowboys/smiley.gif)
Mine pierced primers as well, and you are correct in your thoughts to reduce the length and sharpness a bit. Just be careful and don't take off too much. Once you get them to the right length you should have no more problems with the firing pins, which are a different design than the '72 Opentop firing pins which sometimes need to be replaced. A lighter hammer spring may also help, plus will make the action feel better.
Good luck.