Just curious - these "difficult" co-pilots, would I be right in guessing that they're largely the newer people: most likely with low hours or off an integrated course.
Just my gut feeling, but I'd expect somebody who has been sat in that seat longer, or for that matter done a few thousand hours instructing before switching to the airlines, to be better at understanding and accepting non-standard, but safe, instructions? The chap with less experience is more likely to be aggressively by the book (not below MSA, etc.) - although one hope's he or she would still stop you trying to fly through a lump of cumulo-granitus!
G