If you re-read my last post you will see that if the needle clip is in the top slot, needle as low as possible, this is the leanest position.
Your float most likely adjusts like a car float. There is a tab on it that pushes on the float needle. Bending this tab adjusts the float height from the top surface of the carb. Measure the current float height if you decide to change it so you can go back.
If you pull your fuel line and turn the gas tap to 3/4, you will most likely see way more gas than your engine can use. The chances of controlling mixture this way are real close to zero.