First I would check your tool to make sure it's indeed 10mm in diameter. Then I would check your machine settings to make sure there isn't a diameter offset at that tool position. Then I would look at your post to make sure there isn't some kind of cutter compensation within the code itself.
Now on to your programming. I don't know for sure but I think part of the problem may be that the Tolerance and related Smoothing is set too high for Adaptive Clearing. I've changed that and maybe another thing or two and seem to get a longer pass down the middle which may clear that stock.
Ive also added a 2D Contour pass as an alternative to your Trace. Not that yours was wrong or not giving you your desired results but per the description I think Trace is best used when you have different heights (Z) to machine but you're just smoothing the wall after the roughing.
Maybe worth mentioning is that even though the machine time between your Adaptive and my suggestion is about the same the file size is significantly smaller.
I'm not saying I'm right, just trying to offer help and learn from this as well.
Nick Santiago