So I haven't resolved the noise yet. I've ruled out pedals/cleats. When I get a chance I'm dissembling the drive train inspecting lubing tightening.
Until then I decided it's time to put the X4 through it's paces. Man, it's amazing how quiet a 30 year old bike with 30 year old components is. All I hear is tire hum and an occasional fd rub until I trim. The Syncro II is working perfect too. All's right in the world.