Man, bet his wife been telling him the same thing for years and he just needed a stranger.

Wait, so if 90 seconds gives that light crust, what happens between 90 and 120 that makes it heavy?

The "beaver chewed" part got me because I had the same deal with my stick welding in shop class years back. Instructor kept telling me my travel speed was too fast and I was basically dragging the rod instead of letting the puddle do its thing, and I shrugged it off till I watched him run a bead that looked like a stack of dimes next to my bird poop welds. Turned out slowing down and watching the puddle edges instead of the arc fixed like 90 percent of my problems. Funny how the small stuff the old guys harp on is usually the stuff that actually matters.