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High misfire count with no symptoms

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Location
Connecticut
#1
For a while now I’ve been getting up to dozens of misfire readings on my AP at higher rpm, even with low load. This happens regardless of the tune. I have changed out the coils, gotten new spark plugs, had them gapped, and still got the readings.
Besides that, I don’t get many negative corrections, none over -2. Rarely get any knock, but I get one every once in a while in a pull. Not sure how rare they should be. Haven’t gotten any codes for it even though I end up with over 400+ misfire readings on a longer drive (which I don’t feel physically at all as far as I can tell).

Any reason this could be happening and is it something I should be concerned about? Was told by a local tune shop that works with Subarus I could ignore it but want a second opinion.
 




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