Make the attic in conditioned spaced.
The insulation goes on the underside of the roof and none on the attic floor.
There are lots of details that need to be worked out. And if might not be practical for a retro fit.
But that is really the best solution is to expand the conditioned envelope to include the HVAC system.
You can see several houses that have conditioned attics here.
http://www.buildingscience.com/housesthatwork/default.htm
and you will find more information under technical resourses.
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