I'm just going to throw this in real quick about my little L&R John Bailes flintlock, and a problem I had with it once. I ended up solving it myself (probably more luck then anything else),,, but what happened was that the top of my Jaw Screw was actually nicking the top of my frizzen (just barely) and causing my frizzen to open with minimal flint to metal contact and only showing a few sparks...
So after realizing I wasn't moving my flint forward after dressing my flint so many times - it finally dawned on me...
I also noticed that when using chert flints for quite awhile my frizzin would stop shaving metal for sparks so I'd replace the chert flint with a Black English Flint and it would actually clean up the frizzen (after some usage) and I could go back to my chert flints.
Those flintlock frizzen's can be finicky...
I've no doubt L&R will get you back into the shooting game!
Forgot to mention,,, I think sometimes on real humid days that the Missouri chert flints draw a bit of moister into them... Just my observation.