Nice work man! I need one of the 18 cavity mold. Add it to my long list.
If you're going to try a single ball load try seating the ball all the way down on the powder. I tried dacron and a heavy crimp with no luck with a single ball load. I bet you could get it to work with 1 grain of powder if you pushed the ball all the way in the case.
Some guys on the forum had luck with that method in 45/70 round ball loads.
They said it worked great, consistent velocities great accuracy and no more noise than when it was crimped into the mouth of the case.