well, what are you fucking with? You haven't done a plug chop and given us the results. Have you done any main jet changes? We can't help you when you don't give us results after making changes.
Three rules for jetting:
1) Make ONLY one change at a time
2) Always write down the changes and results
3) Patience
If your going in there with a screwdriver and screwing with the air screw and then messing with this and not paying attention or keeping notes, you'll end up not knowing what you've done, how you got there and how it's so fucked up.
Start with the main jet. Get it dialed in with a 5th or 6th gear plug chop / run. Then, when you got that set, work on dialing in the needle. Start with the air screw turned out about 1.5 to 2 turns and then see how it does. It SHOULD need the choke to start on a cold motor and it SHOULD NOT need the choke to start with a warm motor. If you don't need the choke on a cold motor, your pilot's rich. If the choke helps on a warm motor, then it's lean. Play with the choke when it's sitting there idling to see how it reacts.
Step by step, one step at a time. Write things down and take it slow. Use the chart to help. Just for information, the screw is not really going to solve starting problems and bog problems when doing donuts, it's a very very fine tuning thing. Get the main set, then the needle and work on the pilot separately.