What's your feedrate (in/min or metric equivalent)? I ran it through Cutviewer Mill (can be downloaded free to try) and it spit out over 60,000 minutes, but I'm not sure what feed it assumed though. They look pretty cool. There might be a way to do a roughing cut with a ball mill or end mill first, then switch to the 60 degree cutter for later passes. I can't help too much with the details, just learning myself.