Update again, unfortunately!
So on the bike now, vibrations/pulsing is back…
Rode for awhile and then was like, maybe I should shift up, even if I am riding in ERG… BAM!
Pulsation gone. So even if I am riding in ERG, the difference in resistance feel went from pulsating and feeling wrong, to butter smooth, by shifter to the big ring in the front.
Obviously seems like a software issue then…