Some people add aromatics to the poaching liquid. I have actually done that and didn't find it made any difference whatsoever. The seafood is cooked so quickly in the liquid and spends so much more time in the marinade, that any flavour that seeped into it during the poaching process was negligible after marinating. I have never added wine, but have that same attitude about using it.
It may seem the seafood is not cooked long enough, but better to be under cooked than over cooked as the dressing is full of citrus and any underdone morsels will finish "cooking" by the dressing