If you are following Mikes Directions remember keep the rpms slow 400 max, take your time and remove the chips often. I vacuum the chips constantly. Most of my mills are made with hard maple
I have tried carbide bits in oak (not end grain)and the do not give a good finish. I tried two different manufactures, (Freud and Grizzly)and they have a tendency to tear the fibers in the hole. I drill a lot of 2" holes in 3/4" oak and the HSS Freud give the cleanest hole.
For S & P mills I use the Colt bits system, but they are expensive and they will over heat if you do not follow Mikes Hawkins directions.