They look fine to me, just try it out and see how its aligned for you setting bindings to -15 +15 is generally an average duck stance try to that and see how your legs are feeling and adjust as you need to, and generally I just hot wax a board even if it's new. Most manufactures use really shitty wax/none at all plus wax is cheap while gas to go up isnt
Its a good deal. And yeah he is, how will manufactures know what type of conditions you'll ride in? Usually for park I just have them in the dead center of the mounts at an even 15 duck stance (+15/-15). I'd recommended bringing a screw driver with you next time you go and just adjust for what feels right for you.