Did you ever get anywhere with this? I'm in the same boat right now and it drives me crazy.. Like you said only from a more agressive decel to neutral, it falls on its face. IACV clean as a whistle too.
As far as this being normal I don't think so.
How is your IGN timing?
Do you have any missfires or a rough idle?
I'm gonna chase down the BOV issue a little more. Like posted above if it leaks that could be a problem.. plus a buddy of mine had the same issue with the greddy RS (wich is what I have now).. Fixed with a diff BOV
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