So I got what I need too blasted so I'm done for now. What I have isn't "black beauty" it's "black something else" sold at Tractor supply and it doesn't flow as well as true black beauty. Maybe it is the grain size. It's sold as fine but marked as 20/40 and that doesn't seem very fine to me. The Fine black beauty does flow better but it still stops the nozzle on.
On my pressure blaster I have the media valved cracked about 1/3 the way open and the air bypass full open.