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Chuck the angles didn't look that bad except they aren't tight which makes me think that Stick's suggestion that you may have blade wobble may be correct. I had the same problem once and a set of stiffeners cured it. Some blades, especially thin rim blades, get pulled and pushed as they go through early grain and late grain (I.e. The wood density keeps changing which causes the blade to wander or wobble.) also, check your setup to make sure it's accurate as others have said.
