Found this video where they are talking tire tech with a Dunlop rep. I found it very interesting albeit a bit long.
https://www.youtube.com/watch?v=5dbKoavfmqU
Couple of takeaways:
The OE tire has design input from H-D and while he was 'politically correct' and didn't say it outright the message I got was that Dunlop didn't especially agree with H-D's design.
OE tires (not just H-D) may not be as long lived as retail replacements and may have a bit less tread depth - typically 1/32"
The H-D OE tire and the retail American Elite are built on the same carcass and only the tread pattern and depth vary.
All tire manufacturers will void their warranty if anything is introduced into the tire - Ride On, Slime, Dyna Beads, etc. Not saying these products don't work but if warranty is a concern might want to think about this.
After reading / hearing about current buzzing / vibrations problems with the Avon AV91 Cobra Chrome trike tire and also some problems with the new Michelin Commander III I'm planning to install a Dunlop American Elite front tire (not reversed rear tire) when the time comes. Just my $.02 for what it's worth . . . or not.