You don't trim the choke knob housing. You trim the knob itself. Just want to make that clear so you don't end up cutting the wrong stuff.

OK. Stop fixating on lean, and no more wondering about the jetting. Just follow the procedure step by step the way it says to do it. It will more than likely take going back into the carb more than once. But you need to make the changes based on what the bike says. And don't stress if your mileage doesn't match what others say. For one thing some people don't base their estimates on actual gas used. Some base it on just one tank of gas. And some base it on just one ride. Everyone rides differently. Everyone rides under different conditions. Get your bike set to where it's happy and don't worry over a few mpgs. Riding is too much fun for that kinda stuff. You can do it. Be patient and don't rush it. It will all turn out fine.