Your needles settings should be at about 2 turns on the top end and about 1 turn on the bottom end.

When you make needle changes take your time and allow the engine to run first before making another change. With the settings above you should not need to make much adjustment other than leaning the top end out to the max then backing off a little.

If it still acts funny with the proper needle settings I would pull out the main needle and flush the line with some fuel, then flush out the carb with fuel.
Then check the tank and be sure that its at the proper level to the carb and does not have any leaks. Fuel line can be checked also to ensure no nicks or holes.

Goodluck

Dbow