I think you are talking about the idle speed adjustment knob. I don't know if your problem is this, but my tank had some water in it a while back from when it was purged to weld it, and would have this "bogging down hesitation" if I slowling increased the throttle when starting off. If I gave it a lot o throttle, it would shoot off like a rocket. The hesitancy originally started at 2-2,200 RPM's, then it sort of moved to around 3,000 RPM's, and finally moved to 3,500 RPM's but it was very faint. It was weird, as over the course of about 15 miles, the "bog down" range moved like I said. Then it went away and I haven't had any problems since. I added some "Heet" water remover I got at a gas station.
I also have to ask you. I started with a moped and rode the hell out of it, then took a rider course when I went to upgrade to something a bit larger than the 50cc's I was accustomed too. They included exercises on all the skills you do and then you do the skills test and all with a 250 cc bike that you rode on for the past 2 days. I found it to be a great deal, and when I went to the DMV the next day, I just paid 1$ to get the letter "M" put on my license and then went off to buy a motorcycle. I can't imagine taking the test with the 750. Have you looked into what one of those BRC courses could do for you? I think there are also BRC "1.5" courses that are mostly a test rather than the whole training thing for riders who already know how to ride but want to take the test.