I'm not so sure I buy in to the auto tensioner causing extremely rapid chain wear theory, unless you've got a coil spring from a Chevy in there. The tensioner is located on the slack side of the chain (bottom), while the top side is under heavy tension from the engine sprocket "pulling" the clutch sprocket. Much more likely to suspect a poor quality chain (see if there is a tiny "Made in China" etched into one of the side plates).
The "overdrive" primary gearing that comes with the DD-6 is similar to what H-D did on the '07 ('06 Dyna) and up Big Twins with Cruise Drive. All of those bikes come standard with the H-D auto tensioner, and other than a couple of tensioner failures I haven't heard of any primary chain issues so far. If the theory put forth by the Baker tech is true, I guess the '07/'08 owners will have one more issue staring them in the face very shortly. I'm betting NOT.
Jerry