Float clear tube method

I used the clear tube method with some calipers to get the fuel level exactly 3 mm from not the gasket surface, but the bottom of the flange on carb body. Everywhere I have read on here says 3 mm from the gasket surface. But I just looked in a pdf service manual I have and it says 1mm +-1mm from the flange I was talking about. What is correct. I have surging problems at low rpms and would like to get this adjusted right so I can keep eliminating problems. hopefully get to sync the carbs today too

 

Float level specs vary bike to bike, and are different between Hitachi and Mikuni as well.

There is a specs chart in this: http://www.xj4ever.com/setting%20fuel%20levels.pdf

 

sweet looks like it is 1 mm +- 1mm. Will have to change that and see if it makes a difference. thanks