Totally RC is totally correct, the right inserts are a must. You DO NOT want coated inserts for aluminum. Look at what is available for your cutter, call the manufacturer and ask them what grade to use. An aluminum insert will be super sharp, be carful just handling them. Kerosene, wd 40, purpose made coolant, what ever you use, use plenty of it. Spin the tool fast, aluminum will not burn carbide.
With that shallow cut, you will not need a high feed rate to stop chatter, you want to cut very free and easy and it will polish like a mirror.
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