In my experience, getting the angle optimized between the edge of the flint and the face of the frizzen is critical to flint life. When I try "bevel down" the flint smashes straight into the face of the frizzen resulting in gouges in the face, and very short flint life. Bevel up uses less of the frizzen, but I still get plenty of sparks and dramatic improvement in flint life.
At this point, all other things being equal, it sounds like a soft frizzen.
BTW:
When everything is "just right " it will be "BOOM-tink"....
No fsst.