Running rough at lower revs, seems rich from the plugs, float level queries

[Nebuchernezzer]

Checked the float levels on cylinders 1, 2 and 4 today (3 is a batch to get to but the others appear so far off that I'll have to remove the carries and set the floats anyways).
Pics below,  along with the corresponding Spark plugs. Plugs are only about 35km old.  I'm thinking I'll take the caarbs out,  replace the float valve and seat just cos they are out of the bike anyways and set the floats on the bench (cos who wants to put them in and out of the bike repeatedly?) should be possible to set the floats sitting on the bench as far as I can see, use a coke bottle as the fuel source and whatnot.
What do you guys reckon. They look miles off and the ones with a really high level seem more fouled than the ones with a lower level (the plugs that is).
Logical?
Number 1


Number 2


Number 4