Thanks everyone for the information
I ended up getting sand from a local block place that is a white sand, fine texture and it works GREAT! Had to be the sand. The black diamond is dry as dry can be but just clogs the hose, gun, valve, everything. The white stuff went right through no problems at all. Shot about 80lbs tonight and never had to stop. I was impressed.
Anyway, for the others I would look for a white sand in a fine cut and see if that works better for you.
Good luck and thank you to everyone that had ideas and thoughts - that is what makes this site so great!