I took a look at your log. After the initial spike, your boost levels are on the low side. I also see signs of knock around 5k RPM, but this is a fairly common problem area on 91 octane. I'm assuming this is a Cobb map? I deffinately don't see anything that would exhibit itself as power surging. Could you try to describe in more detail under what conditions and exactly what you're feeling? Maybe you can log those conditions as well.
Thanks
-- Ed
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