All the TightMetal videos are either into a clean amp or a power amp/effects return....none are cascaded into a lead channel or driven from or into other pedals.
The one I did was using a Peavey Vandenberg with its stock pickups which are fairly hot. Mark Kloeppel had EMGs and I'm not sure what pickups are on Jason's Bernie Rico Jr, but they're probably hot too. It's possible that Jason's demo was with 18v, since we were swapping back and forth, but it's more compressed and gainy at 9.
If you turn the Tight up a lot it sounds cleaner, and less thick, so maybe that's it......AND all the demos are closed back cabinets which tends to emphasize the heaviness as well.
Also with the gate on it feels like a little less gain since the notes die really quickly. Mess around with it some more and see what you can get out of it.
Alberto invited me to chime in, and I hope I helped you figure out some settings.
James Brown
amptweaker.com