Pauli, Oak is a killer for the edges of your bits. Odds are they need to be sharpened or replaced. Burn marks are usually the result of a dull bit or moving the router too slowly. Make sure you are not trying to remove more than 1/4" of material in a single pass. Climb cutting or reverse feeding with a router does not improve the cut but it does improve your chances of wandering off your cut line.
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