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Are you sure it's from the valve 'seal'?
I thought one of my tyres was leaking from the valve but it was actually just along from it.
Perhaps that rim/valve combo is bad? Do these look a diff shape to your Stan's?
https://www.universalcycles.com/shopping/product_details.php?id=56286This mentions special valves, but perhaps length is what theyt're talking about:
http://forums.mtbr.com/wheels-tires/enve-tubeless-kit-826784.htmlDid you do up the valve core properly?
ENVE CX 29er rims, Stans valves, the tape recommended from this thread.
I'm sitting here listening to the fucking tyre slowly going down.