Yeah,

Your beads on steel look OK and are now free of the earlier porosity. So, you undoubtedly either squared away your gas, or you're now using better base metal, or you're cleaning the metal better before welding, or your earlier filler rod was dirty somehow.

Don't do AC on steel. DCEN.

Go back to the aluminum now.

Put some new beads on plate and show us where you're at with them.