Using a PC 690 with plunge base. Trying to cut ¾" wide x ¼" deep dado in plywood. Cutting in single pass using an almost new ½" shank Whiteside dado bit. Each dado I've cut in my test boards leaves a lot of "fuzz" (although it is more than that) at the top on both sides of the dado; in other words, it is not a clean cut at the top. Not sure what is the cause. Should I be making a more shallow pass and cutting the dado in two passes? The bit shows burning. Appreciate any feedback.