Michael Sayre
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You're forgetting penalties for TWF.
I'm coming up with +13/+13/+8/+3, since you only have the benefits of Two Weapon Fighting at Monk level 6. They don't act like they have Improved TWF until monk level 8. Essentially, your flurry works like you have a +15 BAB (Monk level=BAB when flurrying, plus Fighter BAB), and are TWF with the penalties reduced as though your off-hand is light.