I have some Beaman ICS hunter 400' s and Carbon express 200' s and also some Easton epic 400' s and 500' s which my boy shoots also. I have had several broken arrows in the last year.
I noticed you haven' t tried the Gold Tip XT' s. All arrows will break given time - GT' s are the toughest arrows I' ve seen yet - they will still break, but will survive more than most others.