You might want to pull the jugs back off, because it sounds like you have a ring proble or they are not evenly ported. If both exhaust ports are not identical you can get different comp readings. WHen compression testing is done it should be done with wot, so a pluged jet would be a none issue there, but could cause a difference in the plug color, but most likly is is because of the problem that is causing the comp difference.
haha I said jugs.