Here's what I would do:
Check float level
Deliberately richen the idle circuit as a test, maybe 1/4 turn. If it helps, you have a lean condition
Chck that power valve is functioning right, moves freely and not with resistance that vary
Then try main jets 2 bigger
If fixed, good, if partly fixed go 2 jets richer. If you need even more jet, you have another problem, maybe a vacuum leak
Or get back to us