A couple of comments:

1) I have never seen a torque for any cross-bar bolts on any Hobie Cat. I don't believe that they specify one. On my 18, I have always made the inboard bolts as tight as possible with a standard allen wrench (They are difficult to make really tight anyway due to their location). The out board bolts I usually make moderately tight using a socket wrench with a 1/2" drive. If you're really worried about it, I believe you can look up the maximum torque for the size and grade of the bolt (this is designated by the hash marks on the head of the bolt)

2) The inboard cross bar bolt threads into a bracket with stainless steel threads. There is basically a stainless nut which is pressed into the aluminum bracket. The aluminum bracket is riveted to the inside of the crossbar. So the threads are stainless on stainless.

3) I have always questioned the practice of trying to align the boat by squaring it up using a tape measure and then tightening the crossbar bolts and trampoline. I suspect that it is a lot of work done in vein. The first big wave or gust of wind, and the boat is going to loosen up and settle in to it's natural alignment. Personally, I think it's better to trust that the manufacturer has done his job by making proper alignment jigs, etc., and just keep the boat tight. I doubt that you can effectively align and maintain alignment the boat using only the slop in the crossbar bolt connections and the trampoline.

sm