This is my exact procedure as well. I can load about 500/hr with this method.The other features I like, but I wish they would offer the ability to NOT auto index. IE, when setting up the press.
I index my 550 with my left hand, load a case with my right, place bullet with left. Not as fast as a 650 with case feeder for sure, where the only action necessary would be placing a bullet, but still way faster than my Lee Turret!