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I've been having almost exactly the same problem. After thorough carb cleaning I have gotten to the point where it idles on it's own and drives fine but has the slight miss and some valve noise as you described at idle, revs up nice but pops a lot on the way down again as you described.

A few things I have been thinking may be causing it are incorrect float levels, need of a valve adjustment or air/fuel screw not set right.

I don't know if this is right, but a friend of mine told me that the best way to adjust the air/fuel screw is to set the idle speed screw to your desired idle RPM, then adjust the air/fuel screw till the idle raises and you get it to the fastest idle possible. When the idle is at the fastest RPM, bring down your idle speed screw back to your desired idle and the air/fuel screw is then adjusted right. Don't know if this is true or not but im going to give it a try. I'm also going to check all the grounds on my bike, clean em off, clean the contacts on the coil ect... as there is a lot of dirt and corrosion. I ordered a remanned carb for 50 bucks, so after all this is done and the new carb is on...if i still have the problem im moving to the valves. Figured i'd share as it seems like our bikes may have the same issue.
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