I do not understand what you mean by "Boosted +2 for Ki Weapon's property." The superior implement Mighty ki focus adds a bonus to attack reflex and empowered crit. Whither the +2 damage?
Flurry of Blows doesn't use a weapon. Merely holding a Ki Weapon grants +2 damage to Flurry of Blows - you don't need to make the attack with it, because again, Flurry of Blows isn't using the weapon because no weapon keyword.