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If all you did was open the lid and used the same filter, pretty clear it's the snorkel with no incoming air and/or the airbox design itself.
After I added hybrids, I got to wondering if the closed AFE SI single filter/snorkel was too restrictive. I bought DCI and tested the AFE closed (fully sealed), lid off and the DCI back to back. That was on the street with the snorkel functioning (with scoops) and, other than IAT differences between closed and open/DCI by the end of the gear, they were all pretty close on logs and VD. Yours are miles apart by comparison.
Why did your IATs suddenly drop 12F before towards the end of the run before you let off?
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