My thought was this: If your wheels/tires sit well inside the fender, then it makes more sense to have the dish out. This is the case with the VW above. This way you are keeping closer to a flush wheel and fender situation. However if your wheels/tires extended past the outer edge of the fender at all, dished IN would definitely be better, so that you are not adding any more frontal area.
Sounds like you should probably dish em outwards.
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