Working on an errata document + a progression system free bonus PDF, but until I get that done, here is the basic progression system: 
I like it! Reads as sensible and appropriately simple and elegant.
First things that jump to mind:
Focused Phantoms get a *lot* of options when they get a fused archetype; including Waiting Game, which breaks when you can get it without the restrictions imposed by Patient Style, Elder Style, or Frantic Phantom.
Focused or Frantic Phantoms will generally scale extremely well with extra stances.
Frantic heroes' expanding combinatorial versatility is offset by not getting as many archetype abilities at once, which I find very elegant.
A lot of potent combos using the extra archetype (e.g. Focused Punk + Fused Winterblossom) are things that a cooperating party would already be able to do, which helps control the scope of things.
Looks good!