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I have a similar thing happening. I don't think it's a fuel quality issue in my case.
I see that something is also happening for you right around 4500-5000 rpm like VTEC kicked in yo...
For me, it developed last spring and I had my plugs changed. It made a difference but it didn't go away entirely. I will add that I had some issues with a previous tune, then switched to another tuner and changed over to E85. It was almost imperceptible but then noticed it had become more pronounced when I switched back to pumpgas for the winter, and ultimately storage.
My car is garaged for the winter, but I do plan on revisiting this once spring hits.
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