Thanks Jeff, that is an awesome find!
I did exchange emails with Chris, the engineer at ORD. His recommendation was to trim them back (at minimum) or to remove them (at maximum). He did not suggest a clearance amount, so the dealer campaign docs you found are perfect.
I also agree with your observation of the softer springs with greater deflection from ORD/Alcans too though - so i think its gonna be more clearance than that in the end. That said, I have been thinking about his suggestion to remove them too. The obvious idea of the bracket is to provide some modicum of steering ability in the event of catastrophic spring failure. But when you see the difference between the stock shackles and the beefy ORD shackles - its really hard to imagine how they might fail, or if they do, steering may be the least of your worries.......
I'll mull it over for awhile...