Air Die Grinder
After doing some research, it seems that all die grinders are air hogs. The good thing about the compressor is that is a 100% duty cycle so it can handle the abuse.
I think the job will go faster if I had some better wire wheels. I didn't realize the wire wheels that HF sells are for drills only and have a max rpm of 4500, good thing I was wearing a shield, long sleeves and welding gloves while grinding. Yikes. I will get some better wheels and have at it again.
Thanks, everyone.