Your feedrate and chipload sound OK. I got the same numbers as you did when I set G-Wizard to the most conservative setting.
If you get a pop, it's because the R8 taper is sticking. You need to put a light coating of anti-seize on the taper, the threads, and in a few other spots. Without that lubrication, you've only got about 30% of the maximum holding force.
(I just went through the same ordeal.)
Read this for more info.
I still haven't retested my mill. Been busy with a crisis today. But after lubing the correct parts, the operation of the drawbar is noticeably different. I suspect that you're dealing with the same issue.