http://www.torparse.com/a/15922/2
Having no agro drop is an issue with that ammount of damage, AP will never ever get even close to pyro damage wise, and it does not give you more tools in PvE situation, the only thing you want is damage.
As a gap closer, I kinda miss jetcharge from the Tank tree but you don't really need it. Incendiary Missle (30meters) -> Railshot (30 meters) and if ur not close enough yet Flame burst (10meters), surely you are in melee range at that point.