This, if by "corresponding" you mean same slot and not same item level. By any means should a PvE item, whatever the item level, should be better than Partisan. If it's an item of superior level, it should be scaled down stats wise in order to never be better than any PvP gear!
They should have done that all along. If you are wearing partisan item or greater, then no bolster. If you are not wearing at least partisan, stats are hard set to partisan level expertise and -5% to other stats from where they would be in partisan gear. That gets tricky when considering which set the class would be wearing, but I suggest a bse partisan stat per class. Optimization would not be an option for bolstered players.