I'll try draining the bowls and starting it.The jets won't flood the bowls over. There may be some dirt that got into the float valve seat.Drain the bowls and then start it up and when it fills it may push out the dirt.
Was a new fuel pump put on? The factory pumps are only about 2-3 pounds, so if someone put a car pump with 7 pounds it can over pressure the float valves.
The sludge was months ago.Even new floats can stick. Give the bowls a couple good raps with something to see if they break loose. Was the sludge from the breather before or after the carb rebuild?
I went back and forth with a couple setups, but either I messed up the carbs in a way I can't figure out or I have a new problem, or both. Carbs flooded a couple times. Then every time I start it for the first time or after hours of sitting, it died within a couple minutes, then started and ran ok. No matter how it was jetted. Changed a clogged fuel filter and started it and the carbs (or lines??) flooded again and was dripping dirty looking gas down the back of the rear cylinder and sounding like hell. So I shut it off and had it towed to a shop.Go back to stock man! Im busy for the next week but I can help you. We basically have the same bike.