My 3 Harley break-in experiences........(I've only had 3 new ones)
2003 Anniversary WideGlide; owners manual said no more than 55 mph for first 500 miles, and no more than 65 mph from 500-1,000 miles. No mention of RPM, I could've over-revved it in lower gears w/o exceeding 55 or 65 mph, but I didn't. I followed the guidelines, it never used any oil in 20,000 miles, then an owl hit me and I totalled the bike and almost totalled myself.
2005 WideGlide; I don't remember the exact break-in guidelines, but I think they were similar to 2003. I was probably a little more aggressive on break-in riding, but not abusive. It's got 47k miles on it now, and doesn't use any oil.
2011.5 FLHTCUSE6 CVO; break-in guidelines were totally different! From the owners manual "During first 50 miles, keep the engine speed below 4,000 RPM in any gear, and don't lug it. Up to 500 miles, vary the engine speed and avoid operating at any steady engine speed for long periods. Engine speed up to 5,000 RPM in any gear is permissible." I did exactly as described, it has 11,000 miles, no oil useage.
I guess all I'm saying is I followed the HD owners manual fairly closely, and it has turned out OK.
I had an old codger in his 80's, who used to be a HD factory backed racer from back in the day ( I can't remember his name) tell me to "ride it like I stole it" and he was standing in a HD dealership in KC, MO signing autographs when he told me that.