All right welders, I am not new to this game. But for the life of me I need to know where all the "snail trails" and occasional but sometimes frequent porosity comes from in dual shield FLUX CORE wire?

I looked at lack of shielding gas: Nope. 25 cfh
I looked at wind or air currents: Nope. Inside the shop and no fans.
I looked at the wire: Nope. Same stuff I've been using.. ESAB 710x.
I looked at the material. Nope. Even ground off the mill scale.

I was welding sched. 40 3" pipe to 1/4" flat bar using .045 710x wire at 25.5v and 380 IPM.
Maybe a couple of you more learned folks can TS this for my old A__!