Hi Splinter,
when I got my FET I completed a few checks.
1. I verified that the blade was true to the miter slots by sliding the miter fence out to the blade tooth (marked the tooth measured to with a sharpie) In the front then manually rotated the blade so the marked tooth was now at the back and slid the miter gauge to measure again. I did not have to do any adjustments as the blade is true to the miter slot.
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2. I verified that the rip fence was true to the miter slot and the blade. I used the socket nut on the rip fence to align the fence to the miter slot and blade.
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My only other suggestion to you would be to clean your saw blade. Wood sap is will make a saw blade appear dull and worn out. I use simple green clean solution (but if you prefer there are commercial blade cleaners available). I soak the blade using an appropriate sized yogurt container lid For an hour or so and then brush the blade with a brass brush.
i do the same checks on my 10” cabinet saw and clean my blades as well.
best of luck.