What I level with is different than what I run in Epics -- Vistani Haste Boost is great through heroics until you can get the boosts from Legendary Dreadnaught. I spend only 34 in Shintao and call it good 12-20 (other than the 1 point for the core at 18), and save any Henshin spends other than maybe a point until late teens. I run Fire stance through Heroics, which can keep up 1-14. Quivering Palm is where Fire Stance is no longer enough, but you can always roll 3 Henshin until you get Duality wraps. My favorite thing about duality is the fact that I no longer have to waste my Goggles slot to be able to play the way I like.
Ultimately, though, AP is only plat to reset. You can easily find out if you prefer Henshin or Ninja Spy spends.