OK, I can't help you with Logic, but there are a few general things that could help:
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VE and VI don't react to MIDI panning, so the data that exists is probably irrelevant.
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The only way to pan (almost) properly in Logic is to use a Direction Mixer plug for every channel.
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Therefore you would probably be better off panning in VE and doing it properly, rather than messing around in Logic.
I hope that hits helps and that I won't be accused of hijacking Mac threads. [;)]
DG