a harley shop mechanic noticed that my chain was slack one day (sounds like the beginning to a bad joke) and suggested two things:
adjust the chain with someone sitting on the seat
dial in rear shocks to finish the job.
after literally two years of riding with chains that were tight when cold, slack when hot, one of which ate through my clutch adjuster pin and other bits inside the left crankcase cover when it got too loose, these suggestions have pretty much solved my chain woes. after this guy reset my shock heights, I have had very little issue with tension on the drive chain.
hym