I think Greyhare will agree, you need to counterbore deeper into your TB adapter so the nozzle is flush to the inner surface of the air stream. You're not getting efficient spray any other way.
Ya, I thought you would say that. Sure am glad I tested it first before sealing it in place.
I will have to use an oversize drill larger than the 11/32" std for a 1/8" NPT tap. That way the tap will be able to go deeper into the hole.
Trial 2 up and coming....