Really screwed up in handedness here. Baseball, bowling, shovels, axes, and frisbies go left handed, Foot balls, golf, racquet sports, batting, and archery I'm right handed. Single handed casting has always been right handed unless need dictates otherwise.
My initial spey readings suggested one alternate hands when conditions were not mandating one hand or the other up top. I took that to heart switching the top hand at every other opportunity and do equally well with either hand up top. Just stay aware of the wind and respond accordingly.
I can do wimpy cack handed casts, but can't muscle the serious push/pull efforts for distance that I'm capable of with the proper hand on top.
All of my reels are rigged for left-hand wind and most line management and stripping is with my left hand. I prefer to avoid stripping and like longer bellies such that I lift and cast near all of the line I typically fish.
If forced into stripping, I reach up to the stripping guide and haul line as far to the rear as my reach allows. With the rod out as far as possible to the front, I move at least 6 feet of line with each individual motion. With my last build, I actually placed my stripping guide about 8 inches further up the rod, so I can move a bit more line with each motion.
My loops are always captured and retained by the uppermost casting hand.
I find it interesting that many well known casters never fully developed their potential and are cack handed. Also, a show of hands from the audience at a recent clave surprisingly showed about 65% of casters are cack handed.