It's not necessarily the gun causing the powder issue. Never had an issue with my Lyman and changed frizzens....it did not fit properly and a gap was present. Changed the frizzen to another new one bought at same store, same brand, same time....no issues.
As for the sights, I agree with Forestry. I've put RMC's and True Glos on Traditions. Both are far better than the junk that comes on the gun. Not too expensive and great improvement for the money. Good Luck!!
Do you smell smoke? Ooops!!! Time to re-load!