I was using a 1/4" supply line to the burner, so I decided to upgrade to 3/8" and it made a huge difference! More flame than I'll ever need. I did have to drill open the orifice. Ended up at .094", which according to the charts is about right.....66,000 btu.
I have not tried to fire two burners at the same time yet, I'm still putting together my manifold, but I think I'll be fine. I have a Marshall 2 stage regulator and I used a standard Lowes 3/8" shut of valve off of the regulator, so I've got a pretty straight shot. I'll hopefully get to the 2 burner test this weekend. Just need to figure out how to strap the black pipe to my brewstand.
Thanks for the tips!