If he does trot, I'd do as much trotting as possible. You won't have a good canter unless you have a great trot. True story.
I'd also like to say, it won't do you any good to keep pushing when he crossfires. Transition down and try again.
My mare has a weak hip too, the only thing that fixed it was solidifying our trot. We literally spent several months JUST trotting, and no cantering. I know cantering is more fun, but trotting is more rewarding. Especially when you eventually get back up to the canter and it's PERFECT. =]
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