From my experience of V1 cuts in the sim at heavy weight, I would always use TOGA (from a Flex take-off, not a Derated take-off). Even if the climb performance has been calculated to be sufficient, doesn't make much sense to use less than TOGA when half the thurst is gone and the drag has increased. Wait until the gear is up and you're stabilised the flight, then select TOGA. Or adjust the rudder trim first once airborne and the gear is up, put the autopilot in, then select TOGA.