Is there a reason why you're using MDV over MDH? I have only used MDH so far.
And are you sure Apex used MDV 0, not MDH 0? MDH 0 gives me Sens 1 on all optics.
edit: From another thread: "You are converting from the ADS sensitivity, so the matching method used is the ADS one which is MDV 0%."
Again, V over H.