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It puts you above the 70% (68.5%) cap; it seems that Hasso and Desperate Blows will allow you to exceed it.
It looks as if there are three different Haste sources though.
Equipment = capping @ 25% (CATA seems to peg this to 25% by adding 10 to 15%)
Magical = capping @ 43.5% (Soulvoiced Double March + Haste Spell)
/ja Reduction = Desperate Blows x3 (Last Resort) = 15%, Hasso (/SAM) = 10%