Ty, we wrap our pork at the end so we don't sauce on the cooker. We do put some honey and brown sugar on the pork when we wrap it. This will add a lot of sweetness. You may be able to put the pork back in the cooker with some of the sauce from the foil for a glaze - never tried that since it wouldn't work for a comp.
For comps we will add sauce prior to putting in the box. Make sure you heat your sauce in the morcowave first so it is hot.