RE: Is it the Gun or what
Stone Cold,
I too have a Traditions gun, Deerhunter flint though, and found that it likes 80 grains of either Triple 7, Clean Shot, or Black Powder. Also, I was using round ball and have switched to the Powerbelt bullet Aero tip, 295 grain which is so easy to load i use my thumb for the initial loading. I picked up the special loader for my ram rod so I would not damage the aero tip.
If I were you I would try 80 grains of Triple 7, loose powder, with these powerbelts and see if you have a difference.
Good luck.
Tom