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Are both sides of the cut convex? I am just thinking out loud but if so, that would indicate to me that there may be a wobble in the arbor. The only thing that makes sense to me is that arbor can only toggle in the horizontal plane which might be a problem with the housing that holds the motor and arbor bearings in place. See if you can manually toggle the blade horizontally. I think that I would take the saw back because there may be no way to fix that.

One last thought…Are you releasing the trigger while the blade is still down in the cut? Blades tend to flex and warp (due to harmonics or something like that) as they spin up and down so maybe that would explain what is going on. Retract the blade before releasing the trigger and see if that fixes are at least improves the cut. A thicker blades would probably flex less during the spin down.
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