I think you’d be able to see the “two stages” of stall on a video of the tac.
Demon air bleeds don’t have numbers on them.
If you don’t know what they are, you have to pin them to find out.
I’m not sure how they’re sold nowadays, but they used to just come as a pkg of blanks that had a .017” pilot hole in them.
That combo, that elevation....... that 850 Demon carb.
That’s really not a very good match.