There are some problems with your math. First off the damage bonus for a 40 delay 2h at level 60 is 34, not 17. Second where do you get a triple attack % of 31.25? That's too high. Monks double attack at 60 roughly 40% of the time not 60%, and triple attack about 20% of the time according to the wiki but that number for triple seems high to me.
I'm pretty sure IFS dunks on addy/sos combo pretty easily, at least on blue. Obviously like baler said it depends on what you're fighting. Something with high ac you're probably going to see the dw combo out perform 2hb.
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