While mine hold just fine with the stock bolts I would definitely agree that the stock Hope bolts leave a little something to be desired -- the actual bolt head doesn't seem to be machined very precisely. When I put the allen wrench in the head they just sorta wobble a bit, which means that I really have pay attention when turning them.
I don't know about using Ti bolts on an axle, they just seem too soft. But of course, ymmv.