I want to learn, really learn about jet kits...

Best advice about float level. Leave them the fvck alone. You are trying to get them EVEN more than anything and usually the factory is very close. If the floats leak fuel it is because there is debris,ie dirt,trapped between the needle and seat. Bending the pee out of the tab on the float will probably do more damage than good.

Carb adjustment in a nut shell.

Idle jet,idle screw is only for idle,up to say 1/8 throttle.

Needle and needle jet (the hole size the needle fits in) is for controlling the fuel added as the slide raises. Moving the "clip" position adjusts the amount of fuel at various position. Different needles with a different "taper" can adjust fuel available at different ends of the travel. Hopefully the jet kit manufacturer has already made a good choice on the needle taper and you only need to adjust the height,ie clip position.

Main jet is for only wide open,ie 3/4 to full throttle.

The problem is with CV type carbs the throttle position is not exactly where the slide is raised to. The motor must "suck" the slides open and this is the problem using "pod" type filters or open stacks.

On a CV type carb if it is really lean,the bike will go no faster from say 1/2 throttle up. Basically the motor runs out of fuel and turning the throttle further cannot lift the slides more.due to lack of fuel. The opposite is true if over rich,the bike will accelerate nice then miss and fall on its face. Basically the slides open clear up and "flood" the motor.

Go back up to my earlier post. Almost all motorcycle carburetors operate the same way. The CV type carbs you are not in direct control of the slide,it moves by engine vacuum,but the operating ranges are the same. If you have a "bog" in the midrange it is more than likely the height of the needle. On jet kits the needle will have several "clip" positions to adjust the height of the needle,realtive to the slide. The needle determines the amount of fuel by the taper restricting the flow of the open hole size. Lowering the clip position will raise the needle and make the mixture richer.

Screwing with the float height is dangerous. If too low there is insufficient fuel in the bowl and if too high,can over flow into the motor or out the vents. Think a toilet tank that runs all night and you can see the problem. Changing the float height is to make the fuel "pull" into the motor easier,because it has less distance to lift. The problem can occur during hard braking with elevated fuel levels can cause the motor to flood from the fuel rushing forward. If the floats are not "even" is more problem than the actual level as this will make one cylinder run different than another. The shut off needle has a spring preload and a good way to check for non-equal float level is to turn the carb rack upside down and look down the row of floats. If they all look nearly the same I would leave them alone until at least I rode the bike after installing the jet kit.