If you have the room I would say add a refugium as a separate system. Connect the fug to the wet/dry with at least the same size piping that you use for the overflow. Additionally, if possible I would take the bio-balls out of the wet dry and put LR or LR rubble in there instead. IMO this is the best set up you can have for filtration.
So what I would do is overflow to the wet/dry. Have the connecting piping go to the refugium. Keep you protein skimmer in the wet/dry. Then have your return pump in the fug.