Max your power, and put your wire speed way low. Just make sure you don't burn your tip. Get that effer so hot it burns holes, and adjust your wire speed up from there. That is where you want it set.....hotter the better. That'll get ya penetration.
I also liked the idea of having somebody with some welding experience look at. Anybody that can weld should be able to figure out these little welders, and maybe experienced hands would be best to help ya get set, or close.
Good Luck man.....I hate being frustrated.