Plunge Burns?

[SarahRay]

Hello,

I’m cutting 60x35” oval countertops out of 1” MDF that has bee laminated with melamine.

Using a 1/2” straight plunge 2 flute and did these 3 tests at the feeds and speeds shown. Bit was hot after tests 1 & 2, not so much on #3.
Cuts quiet, with nice smooth edges and no chipping.
My question is how to get rid of the burn marks shown at the plunge point?

Thanks so much for any help.

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