Thanks all for the input. I readjusted the primary chain tension (w/o stripping the plug this time! - or ripping out my TimeSert!). A new issue has popped up, and perhaps I already know the solution, so just looking for confirmation and additional input.
Now, the whine/groan is gone when started and put into gear. Unfortunately, when in gear the clutch doesn't engage. Is this a slipping clutch? I haven't readjusted the clutch through the inspection cover yet, as I need to grab some rear stands to level the bike so primary fluid doesn't pour out the clutch inspection cover, but I have adjusted it at the cable adjuster. I'm really hoping that this is a clutch adjustment issue, as it is disconcerting to have the bike do nothing when in gear, clutch released and throttle applied. I feel so close, yet so far away...
Thanks for your continued help everyone!