Yes, 6011. I don't know which is worse any more, my memory or my attention span. Anyway, 6011 is very similar to 6010 except that it has some additives in the flux to make it run on AC, which 6010 virtually won't.
It sounds to me like you did it right and it worked. I didn't understand that the materials you were welding were so lightweight. A job like that is usually quite a challenge. Thin material which burns through easily, deep penetration rod, vertical up where the heat (and the chance of burning through the material) increases as you go. I'd say you could just as easily be bragging about a good outcome as wondering whether you did anything wrong.