Last night I lowered the floats by a little over a millimeter.
I have to say, it's an improvement.
The bike seems to run smoother, low speed riding is not as jerky, I have less popping in the exhaust on deceleration, and I don't smell unburned gas any more.
I still have a little bit of a hunting idle, but that might be just need to resynch the carbs.
Of course, the test ride I took is the last ride for a couple of days, as it started raining this morning and is expected to continue until Thursday or Friday.