RS 34 Float heights, Wet vs Dry

Getting my RS 34 ready to install , have replaced jets, bench Synched, today checked float heights dry all at 17.5 mm.
On the bench stand did the wet check, all fuel levels way too high, number 2 carb was just dripping fuel from the overflow.

After 4 adjustments finally got the fuel levels down to just under the gasket face, to achieve this i am at 23 mm on the float to carb face.

I will go with the wet level test, but curious as to why i have ended up with being so far offf Mikuni spec ?
Im sure a lot of folks dont check using the wet test , any info or thoughts on why such a big difference to achieve the correct fuel level ??
Thanks

I had the same issue on my bike and learned that each float is not going to be able to carry its own weight and especially after age they will lose their floatability. Therefore doing the wet test is more accurate.

IMO, forget attempting to set RS flatslide carburetor floats with the (3mm below) clear tube method. 
It won't work because the RS carb float system is designed differently than BS34 CV carbs, for example.
I have personally owned three different RS series carb sets, and the 17mm +/- measurement method typically produced clear tube measurements around 4-5mm ABOVE the float bowl tops.

Site search result for daveo RS carbs way back yonder in 2017:

 

Not such a good pic, but this is on the bench at 23 mm, fuel level is now consistent across all 4 carbs, its lower than before and number 2 carb has stopped dribbling, i would sometimes see fuel dropping onto the floor, particulary if using the side stand, Hopefully this is the fix.