I had a set of 12.5" 440 HDs on my SE Road King (roughly same weight and suspension travel). I want to say that our stock shocks are about the same as the MOCO air shocks set to about 35#. WAY TOO STIFF:soapbox:
On the Progressives: 1-up, I used 1 1/2 turns. 2-up, I used 3 to 4 turns depending on luggage. Fully loaded, I ran 4 1/2 turns. I weigh 230, and the chairperson of the board weighs about 130. These shocks are very adjustable and will be next on my list for my R3.
Also wanted to note that my SERK was already lowered and should have had 12", but I opted for the extra 1/2". The ride height went up a negligible amount... 1/4" at the most.
Hope this helps,
Steve