Larry,
The wyes you used to weld up were far better than the ones you use now. Why didn't you stick with those?! They were awesome! yes, I know they are tedious and expensive to produce, but some things are worth it. Just charge enough to make them worth it and be done with it.
Turbulence is the enemy in a U or tee configuration. The one Larry posted is certainly better than the one used at the bbq, but neither will perform as well as the one Jeff (Greenie) makes or the one Larry used to make.
Larry, please brink back your original wye!
Take care,
Lisa