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@benbrangwyn
I'd be a little unhappy about this too, though I hear the point about preferred chain alignment.
I'm assuming that you've tried ALL height variations - I'm asking because the profile of the inner plate often changes across its face, and that can cause chain rub and can often can be dealt with by some subtle height changing.
If that's not the case, then your fr derailleur is too narrow for the gear range and chainstay length (the length will affect the chain angle). So either live with it, buy a new one or experiment with some potentially disastrous widening techniques. I'd do the latter if the derailleur isn't too special.