I agree with XL.But also,it could be your arc length has something to do with it.
6011 rods are kind of tough to make a real nice looking bead with unless you have a lot of expertise,7018's run smoother.But every rod has its purpose.
Something else....as far as porosity in the weld beads,rusty metal will cause this.6011 will generally cut thru rust and paint with no problem,but if possible the metal should be cleaned as much as possible first.
Just keep practicing guy,you'll get it
.......Digger2