Rod angle at about 20 degrees down from the weld, tight arc, current, I find more or less what you'd use on the flat, but you have to experiment to find what works for you, then make the weld so that you don't lose contact with the weld pool, but not so slow that the weld pool, pulled by gravity, beats the rod. Or you can weave. You're going fast.
The weld doesn't have much penetration or weld metal deposited and is rather flat, so not strong but it looks good. OK for thin metal and welds such as ornamental welds where the appearance is important and the strength is not so importantt.
Probably very different with 6010/6011 with a very forceful arc and fast freezing.
Vertical up is much better from the point of view of strength.
V-down requires typically much higher current than in flat position (30-50% more).
6013 rutile-cellulosic weld great in this position, but as said, strength isn't (not by far) the same as 7018 v-up...