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I couldn't wait till tomorrow! Did a quick test with dry beans and got into a few problems:

1. The valve is too powerful, I may need to cut the max flow in half or more. The thermal tape I had on the de-chaffer started smoking, which it never did in 100+ roast on the electric element. I have pre-set my PID to 10% min, and 80% max, but my need 20% min and 50% max. Lots of tuning to do on the valve and PID.

2. Ignition is troublesome mid-roast when the PID reached set value, the flame goes off, and can't come back on until I slow down the blower. I need another way of insuring flame remains on.

I need to stop for a few days to work on the electric element so I can roast a few batches (running out of coffee), then get back to the gas which needs more work and research.