Not true on the 12-bolt. I run a 4-series spool, right now 3.73 (the only 3-series gears that are made for a 4-series set-up), but I have a set of 4.30 that I ran for a couple years in the 12-bolt. You would just have to switch over to a 4 series spool and gears.
IMO the easton posi is very good, but the more power you add on launch, the more chance you'll have to brake it. At what $450 a unit, it could get expensive. Just driving it around town I would say it will last quite a while. With your power adder I would stay 3-series, possible switching to a spool.