I used a single flute upcut bit with nearly the lowest speed on the router, 1500mm/min (so 25mm/sec), 4.2mm DOC, straight plunge (when doing trochoidal it goes down in circles anyway), 450mm/min plunge (7.5mm/sec) and 20% trochoidal stepover.
It’s really important to go quite fast to have big chips or it will melt. Christian, the guy who made Estlcam says you should go as fast as you can without your router losing its way (because of the forces when going in circles) and also advises to cut the full depth. In your case I’d go 6.2mm DOC, same settings for the rest that I used. Using a 6mm endmill, I cut aluminium at nearly the same speed with less stepover and 10mm DOC (with a bit of flex, to be honest, but it did work well).
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