We did a pretty standard, regular frills trip with beer and good food in two 14' self bailing rafts, each with stuff and 2 passengers and ~4 kayakers (10 total) at about 500 cfs at launch and 350 at takeout. May 12, 2003.
Not too bad. Lots of rocks to be dodged and the requisite low water skills are requisite. No bad wrap rocks, though. Black Rock is a scout, as well as Quartzite and Rat Trap, and maybe a couple of others. I would launch just above Cibecue (there's a decent camp right there off the road), or just below. Anything in the first ~4 miles from The Bridge, are ridiculous at that flow, good above 700 (in a 14' raft).
Check the new rules for the Indian Permits, absolutely be chill, and humble with the Indians. Those guys don't fuck around. Get 'em from Mild to Wild, apparently.
Overall, really low water trips on the Salt are good. I've done a few trips down there, and it never gets undoable, high or low. Put your kitchen up high, and always anticipate dramatic river level increases.