I saw/read your last post, but I don't have any info for you. Not sure why no one chimed in.
Full HD service with fluid replacement and full inspection, plus various things the mileage calls for such as replacing the triple tree bearing at the 25k service. Plus I did a stage 2 kit in there as well, and they do a test ride every time to make sure all is good. Of course the bike will never do it when they have it.Can you elaborate on what "Groaning" is? Does it sound like it could be the clutch friction components making noise when starting to engage then it stops when the clutch finally grabs?
When you say 'serviced 4 times'...what did they do? Are you just talking primary fluid replacement?
I'm running the Amzoil synthetic in it rather than the default HD oil. I'll look at trying something different next go round 3k miles from now.For an actual test, try changing the primary fluid to anything other than the stuff from Harley ... Seriously anything... Because regardless of whether it gets better or worse, at least you'll know you're on the right track ...(if it does something different)... Or not.