Rough running 'Rude

[GreenF350]

Well, what the heck...I can't seem to figure it out right now, so I will let you guys chew on it for awhile. I have a '91 40hp Evinrude on a Bass Tracker that I cannot seem to get to idle right to save my life. It runs rough at anything below say...about 3000rpms. This of course is causing me all kind of trouble getting it to idle right. It runs great 3000rpm+. So far I have replaced the coil (did nothing) the power pack/ignition module (Made it idle...it wouldn't idle at all before that) I also replaced the spark plugs (a few times over the last few outings), took apart and cleaned the carbs and also readjusted all the linkage and carb adjustments....What's left? I plan on replacing the plug wires this week, but they look and ohm out good. Any ideas? It's still on it's break in since I just replaced the powerhead (I bought it with almost no compression on one cylinder) and am still mixing it with extra oil, but this seems beyond the normal oil issues (plug fouling and not quite as much power). Hit me with some ideas and I will go from there. Thanks for any help.
-Aaron