I took Tom's advice and extended the swing arm as safely as I could, by 1.5", and it gave me some more clearance, but still not enough for more than about 2 inches of articulation. I know I have to move/modify the lower shock mounts, or buy some longer shocks
I would like to avoid any more main frame modifications, if it is possible.
I decided to take a step back from the frustration that is the swing arm, and look at the exhaust and wiring and see what could be done with the muffler and wiring, and where to mount things.