I can't answer all your questions on this one, but I do understand that you can have both the phoenix and the insight at the same time. I don't know though if the phoenix can adjust for tire size. If it can, it can be tuned for the tires and then if you change sizes you will have to purchase new tunes. Also Bill's tunes are the same across all his platforms, so the phoenix can have the same ones as a Gryphon.
Hope I helped.
