Your build has all the necessary ingredients to be a great one. The efficiency of a build depends greatly on the enemy-build, and especially on the relative turn-order of his-and-your units. Your "killers" are in slots #5 and #6, which is pretty much in-line with the current metagame. So, there's nothing much to be gained (or lost) there, meaning that you'll
just have to play better than the average opponent/build to win
Maybe switching the WM for a Shieldbanger would be better. I believe that the statting of your WM is maybe
too versatile (high STR, high AB, constant-damage ability) so that you'll not have a clear role for him in-mind: Should he break enemy X? Should he attack enemy Y? Should he do SI on enemy Z?

In my experience, its better to have units with clear roles in your team; well, that might also help the opponent to "get in your mind", but it's much straighter and simpler to play. Remember: Simpler is better! That's why multi-thrasher builds rock
Now, some more, unit-specific, comments:
- Raidmaster: I usually aim for longevity in my RM, e.g 22(ARM+STR)/4WP/1EX/3AB . You've statted him with low ARM+STR (18), and high EX & WP. That makes him look like a kamikaze! However, that fits with your "Team 1" role

- Warhawk: I believe that "damager" units must have maximum mobility, i.e. 2EX for WH. Remove one point from his STR and give it to EX. Else, you might regret it when you find yourself "cornerned" in a Warrior-vs-Warrior standoff situation...
- Bowmaster: Nothing less than 7ARM will do, for me. Unless you keep her waaaaay back and well off-range, I'd make it my 8STR BM's goal to snipe yours, for 2 damage at a time, or better, do a run-and-gun on her for 5 damage (+3WP) with an SS or a BM...