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Hmm . . . I'm confused. You said you replaced the valve seals, but you are thinking it may still be a valve guide seal. Is there more than one seal per valve?
It does seem unlikely that a bad valve guide seal could soak a cylinder like that. However, these cars have been known to blow the seals off their perches if too much boost gets up the valve guides. I heard that Porsche issued a TSB to use Loctite when installing the seals to help hold them down.
You may want to confirm the integrity of the hose from the cycling valve to the wastegate. If it's broken or plugged it will overboost. I would also confirm the setting on the Lindsey Boost Enhancer.
Best of luck,
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Jeff
78 911SC, Silver/Black, H4's, Recaros, 964 Cams, Custom Exhaust, 16" 930 Fuchs. Lowered & Loud 
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