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I'd say having the blade as high as you are comfortable with. This means each tooth is in contact with the wood for the shortest amount of time so less chance of things getting hot (at least in theory!)
Seeing your burns seem to be at opposite corners, could be your fence is not exactly parallel with your blade.
If the far side of the blade is closer to the fence than the front side where the cutting occurs, the teeth will be rubbing a bit as the wood passes by and makes contact. On the far side of the blade this contact first occurs at the base of the teeth as they rise up out of the table versus the teeth tips as they plunge down at the front.
Seeing your burns seem to be at opposite corners, could be your fence is not exactly parallel with your blade.
If the far side of the blade is closer to the fence than the front side where the cutting occurs, the teeth will be rubbing a bit as the wood passes by and makes contact. On the far side of the blade this contact first occurs at the base of the teeth as they rise up out of the table versus the teeth tips as they plunge down at the front.
