Well my plan was to run some new gears be it reimax or some other local options most around the mid $400 mark in my standard pump and a collar but I'm just as worried about to tight as too loose and everyone seems to agree that Nissan may have left a large amount of clearance there cause of the flex from the i6 crank moving so much and pushing the gears into the pump housing. Ideally I would have liked to go a splined collar and gear set(2j style), but I have such limited info on the long term success of this solution for similar reasons.
Fwiw when I pulled of the standard pump on short drive nose clearance was .43mm so about .017 in old money. With hammering witnessed on both crank and gear.