I think if they tried running at Silverstone or Monza or somewhere they'd only last a couple of laps at race pace so would have to be cruising round like grannies to make the charge last. Even on the street circuits they seem to spend 50% of the time off the throttle coasting. They really should be embarrassed!
the chains tight spot is in the freewheel, they all have them, check your chainline, that can sometimes make it worse. as for wheel being central with the cams thats not necessarily the case, spacing/washers/cam type/position/odd cams/ inside outside dropouts/ bent frame/ dished wheel/ etc can all make a difference, a picture of your setup would be helpful.