Re: vacumm leak???
The higher idle when you choke is a sure sign of a leak. Suggest you use wd-40 to test things. With the choke open and the idle turned up some spray around the intake mount, then the carb mount, then around the cylinder base. The motor idle should slow when you hit the leak. If you find no leaks lower the clip on the needle one notch. A to lean condition can cause that too.
Put something FUN between your legs..