Thank you for the reply Mikey. I was hoping either you or Frosty would chime in.
I'm not sure I understand which fittings you're recommending I replace. If you're referring to the 'T' fittings, I used T's with 1" inlets reduced to 3/4" as laid out in Frosty's instructions. The mixing tubes (again, if I understand correctly what you're referring to) are 3/4" nipple.
In case you missed it, the last "picture" is actually a video of the burners running. Am I still missing something?
Thanks again!