Insulating & Ventilating Vaulted Ceiling
You didn't say but I assume you have a good ridge vent. There should have been the styrofoam chases against the underside of the decking to get a good air flow also.
This may not interest you but when I built my house with a vault, I had the same problem, I looked into installing a "skin roof". A skin roof is a roof built above your existing roof with an air passage between. The skin roof is built with the chimney effect in mind.
Hot air rises drawing in cool air at the bottom and discharging at the top. This would keep the existing roof much cooler in another way, the sun would not hit the existing roof. I don't know if this would work or not as I have never seen one personally, maybe someone on the forum has. Just a thought.
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