For the HS6 the float level is measured with the float lid upside down
and the distance from the top of the float to the bottom of the lid
is 4.8 mm or 3/16".
For the HIF6 the float level is set with the carb body upside down the the
bottom of the dip in the bottom of the float is 0.5-1.5 mm (.020-.060")
above the bottom flange of the carb.

Too high a float level (with the carb right side up) would certainly
make it more prone to flooding but if it is overflowing the float
chamber lid (HS6) then it is more than that.

Another problem I have had is insufficiently tightened float valves
working loose and leaking past the gasket ring. Currently my problem
only occurs at high rpm so I suspect it is the vibration of an unbalanced
engine shaking the float too hard.

BTW my Pierburg mechanical fuel pump blew the diaphragm on a fuel pressure
regulator and nearly drowned my engine in gasoline. Pressure never exceeded
3 psi as nearly as I can tell so I conclude the regulator was defective.
Fortunately no fire.
--
George Downs, The "original" Walrus3, Bartlesville, Oklahoma