Not sure how to address all of the many issues your revolver faces, but old revolver shooters use this to get rid of leading: https://www.wholesalesockdeals.com/3...waAt3pEALw_wcB
Use a pair of scissors to cut out a piece about the size of a playing card, then wrap that around a nylon Glock bore brush and run it through your bore. 10-20 passes should get out most of the leading.
Okie John