You are correct the Eddy heads weren't checked out. This was before I knew that Eddy heads need to be checked. They claim they are ready to run out of the box, but I know better now. What problems do they have?
Piece of advice... EVERYTHING should be checked, always. It's all mass produced, and most of those parts need tweaking. Yep, it sucks to shell out cash for brand new go fast parts, then shell out more cash to have a good machinist check and correct anything that needs to be. BUT, it saves you bigger money, and time in the long run! As you just found out...
Hope you get it resolved, and good luck to you! :)