Not a crappy video at all, it's actually plenty informative.
A few comments:
- pretty clear that Tejas setup isn't cutting the mustard at all. Did you happen to compare the orifice diameters between theirs and the Williams kit?
- the burner output level should be controlled with the needle valve, not the air shutter. The air shutter should be tuned to account for the setting of the needle valve to provide the cleanest flame (mostly blue with faint yellow tips) so you don't coat your kettles with carbon (and waste gas)
- compared to the video I linked earlier, even your "good burner" seems to be producing considerably lower output. If you're using your shorter 1/2" ID gas hose in the video, I have to wonder how much piping you have inside the residence from the household NG regulator to your hose connection, or if the NG regulator needs to be adjusted, because it just seems too low (and too quiet)
- and on that last note, it might be worth having someone with a manometer check the household gas pressure at your hose tap.
Still, it's pretty darned clear there's a dramatic improvement with the Williams valve/orifice and 1/2" flex hose. I'd send a link to the video to Tejas and see what their response is to that