I'm welding some 1x2 rectangular steel tube, 14 gauge. I'm using .030 with C25 at 25cfm, 18.3 volts and 230 ipm. Gun angle is directly above the weld, pushing at maybe 15 degrees. Prepped with a flap disk and acetone.

It's been several months since I've used this gas, and I've heard of you let gas sit for too long, you may get undesirable results if you don't agitate the cylinder. Could this be from the gas "settling?"

...and feel free to roast the weld while you're at it.