Yeah, that's what I figured so I already did that but even with the chain very loose I still get this vibration, though not nearly as bad as with it tight.
Today I jacked it up and went link by link. It seems like I have a 3 link section that is just a little tight. The links still move just not as freely as the rest of the chain. There really doesn't seem to be a "tightest point" and I know the adjustment isn't too tight. There is plenty of adjustment left to go if I need to tighten it so I'm not worried about adjustment. Maybe I'm just being a little over sensitive but I think I might have one of the techs at Ericos take it for a spin to see what they think.

Keith