Make sure air box is in place and sealing good. OEM box requires suction and too much fuel will drown it and stahl. Zero out the air/fuel screws and then. Go 2 turns out and test and then in quarter to half turn increments and see if it improves.
Also, leave the choke in. Once i restored my 02 VT750dc i found i never need choke... Ever. If you put an after market air intake, this could be the problem. Use clean plugs and then idle it for say 30min. Then check a plug. If its oily, too much fuel. If its a burnt white, too much air. Hope this helps.