first step
obtain a factory service manual, to see if you assembled the carb correctly.
it will also show correct procedure for setting float.
there are parts not visible internally from just these photos alone.
its sounding to me like the actual slid needle main pilot jet was not installed correctly, it should be installed from below, under that metering jet and emulsion tube (the one with the hex)
compare the bore of all 4 carbs visually, where the slid needle goes thru that projection sticking up from the bottom.
they should all look the same. shoot and post a picture looking in from the rear of the bore.
it is virtually impossible to analyze and explain all this, with so little to go on, not having the assembly in front of us.
the water comment was concerning contaminated fuel, and it causes blockages in the primary low speed idle circuit...