I don't have the equipment for a leak down test, unfortunately. All I have to go on is the similarity of the compression test on both sides, and the fact that it runs well under load - this doesn't speak of any major internal issues to me.
It doesn't seem like there's much play in the throttle shaft, just a little bit. It is missing the throttle shaft seal though... same with the choke shaft.
I did take the intake manifold off altogether and didn't see any sign of leaks on either side. Now I have it re-sealed with RTV silicone which isn't ideal but I've observed no change in the behavior so I'm guessing it's not the issue.
When I adjust the carb so that cylinder 2 stops misfiring, the idle mixture screw is pretty much turned all the way in, and if I go much further both cylinders just die, so I can't imagine it's running too rich as a whole. Then again, the bent idle mixture screw could be messing with the adjustment...
RLP
