i use a clear hose attached to the float bowel drain to observe the actual level
in fact i ride with them on the carbs
i route the hose up the side of the carb u bend it straight down so water cant get in
makes for a quick diafgnosis check if out riding and having fueling issues
on the vm mikuni as well as the keihins you want the level to be at least 6mm below gasket
if you have a pamco in there yank it off and put the points back in you have to or you could go mad chasing a carb problem that is really an ignition issue
the pamco is good unit but they fry easy from simple little wiring snafus
And I set them to 3-4mm below the gasket surface - no lower.
The answer is that if you set fuel levels and not FLOAT levels you will be far more able to adjust them and see the effects. Your fuel levels will also be much more accurate.
CrazyPJ has some CB360 carb synch tubes in 6mm x .75mm that happen to match many smaller sized Mikuni and Keihin float bowl drain screws.