For Out of position welding like vertical uphill, Short circuit mig welding requires some manipulation of the gun to prevent excess convexity of the bead profile. Dual shield flux core is different. This video shows the distinct difference in speed and bead profile
Once piece of advice I tell students for Stick welding overhead with 7018 is to set the machine hot enough that the rod will not stick even when you hold a tight arc....then hold a tight arc.
For dual shield flux core, polarity, voltage and wire speed settings, and stick out make the difference.