Can a choke cause this problem? both of mine were removed and blocked off with the webber block off plates.
I have mine gone too, and that is not the problem with them being off.
As you said u feel one pulling harder. So the one side is not leaking and the other is. Sometimes you cant tell with carb cleaner, or water etc. I have had problems with mine since I have had them too.
Basically they are all seated, the air bypass screws and the carbs are not level with each other, then you can use them to level them off.
Make sure one side is inn sync with the other, then do the other side.
You seem to have the same problem as me with one side always being off.
I havent adjusted my float, But i have found my throttle stop(idle speed screws to be off). If ur butterflies say are not closing, and you swear there is no leak( just like me) then pull up on your throttle on that carb that seems to be moving less air. For me that was just it. Basically it would sit on the idle screw but my butterflies would not close. I think its due to the spring so I am going to replace it. As I held it close it was almost level with the other side, so maybe thats ur problem too. I was able to get some springs from sears hardware and I am just going to double it up on that side.
Make sure you do it with the linkage off since mine was also hanging them both up at different points since one side was too tight.. good luck with ur carbs