A proper electrode grind and keeping the electrode a reasonable distance from the weldment have always worked for me. Gas flow wise, I was only flowing 35cfh for that weld, which is only 5cfh higher than what I normally weld at. The two collector halves act as a valley and, since argon is heavier than air, the shielding gas pools in that area to provide good gas coverage.
Let me know if you guys have any other questions.