Knockback still refers to Precision Strike.
Also, when you talk about "weapon attacks" in Weapon Mastery, what do you mean? Manufactured weapons or manufactured and natural weapons?
Is Tactical Expert meant to stack with Powerful Build and similar abilities? Because I think by a strict reading it does. If this wasn't intentional, perhaps you should borrow some of Powerful Build's language - "one size category larger than normal" (difference in red).
When does the Fighter gain Battle Awareness? It isn't given a level either in the chart or the description, and Blindsight at level 1 is... ah... not entirely balanced.
Does Watchful Blade trump Tumbling? It'd be best to state that outright just to clear up any possible confusion.