Called the dealer today and they still have found no solution. He said they have been back and forth on the phone with Honda and tried replacing grounds, IACV, pcm, plugs, took fuel samples etc and nothing has fixed it. They recommended a power commander to try and see if that resolves it as the only thing they are seeing is a lean condition at idle.
I guess I'll go pick it up tomorrow and put the factory exhaust back on and see what happens. Real annoying when it's been there for weeks and nothing has changed. He did say they checked the plugs but didn't replace so I'll be buying two of those tomorrow and try as well. Back to square one I guess for now.