I have always run in 1+2 when starting up and when surfing, wakeboarding, etc. When I get to party cove I switch to battery 1 or 2.

I do have the loud pop on start up and cannot get rid of it starting with battery 1, battery 2 or battery 1+2.

I would think that after the "thermal event/bad alternator scare" that they just had that we would get a definitive answers to questions concerning this and a resolution to the popping on startup from Goose or one of the Tinkers.