Yikes, yeah, don’t try drilling holes in metals with your Shapeoko. You can get away with it somewhat in wood but metals are unforgiving and as you can see, exert a lot more force on your endmills.
You should instead bore the holes with a smaller endmill. Pick up some inexpensive 1/16" 2-flute endmills on eBay and then bore the holes using a helical toolpath. Endmills do not like cutting in a parallel direction to the shaft, they like cutting perpendicular.
Like a couple people mentioned, you can try some drill mills but be very careful! Standard drill bits are meant to run at <3000 RPM, not at 10,000 RPM and that speed can easily cause them to deform and shatter.