Just a few things I have noticed & though about...
As Mark cited, check float level... had that happen & cause some stuble b4.
Street use... I wonder if the 750 is still too big?? Maybe 650-700CFM DP?
Does it have primary PV's? Checked it for damage?
Have you had a vac/gauge on it yet?
has it ever been responsive correctly w/ this carb? Is this a new issue or are you just trying to get this carb dialed in still?
BTW: hows things after the wreck??? Did the insurance company come through & help? Good luck. Scooter