Mac,
I'm just throwing out a thought. I have a Solex. It was running a bit rough, but I can't remember if it was at idle or throttle. I developed a small leak below the float bowl. I'm not sure where it was coming from. It was hard to detect, as the fuel would evaporate the minute it hit the manifold. I tightened all the nuts and screws. The leak went away, and the Jeep ran as it should.
Tim