[Ed Wright]

How are you setting the floats? With the sight plug in the side? I don't know too many racers that do that. Take the bowls off, turn them upside down, and use a drill bit for a gauge between the top of the bowl and top of the float. Most use either a 3/8" or 7/16" bit for a gauge. I think if you do that, then recheck them later you will find the float level is not changing, but that you have other problems.
What do you mean "fuel everywhere"? Fuel sloshing out the vents? That is not a float level changing problem. Try a 7/16" dril bit first. If the carbs are set front-to-rear, not cross ways, you will probably want to use a 3/8" on the rear bowls.