THANK YOU to all of you that have weighed in with your analysis, pointers, and especially encouragement!
WEIGHT DISTRIBUTION
@Rob--- Your hunch is 100% correct

. I do have a VERY strong tendency to be front-foot heavy. What you say makes sense... I am loading the nose pretty hard (and way too early) going into the turn, causing it to hook the board into a very short radius turn, giving me very little chance of laying out.
ROTATION
@Peter and Matti---- You are both correct that I am not aggressive enough with the rotation. I love your brother's advice Peter

"In order to get LAID in the snow, in pursuit of the perfect BACKSIDE, one must gyrate(ROTATE) hips to aim penis to the goal"
I should be attacking the backside turn with a strong, committed rotation from -Egyptian to a +Cross, along with a very deep "pull" almost squatting over the board as I prepare to "push" the board once the backside edge engages
TRANSITION
I have guessed that the entire success or failure of a backside EC attempt is predicated on getting everything set-up and timed correctly. Watching my video, and noting your observations, it is now clear that I did this...
-From the frontside, I have the approach ready, BUT...
-Did not squat back far enough over the rear foot(need more aggressive "pull" as I start dialing in the rotation)
-Did not rotate aggressively to set the edge early enough
-Front foot was already too heavy as the turn started
-Only started pushing the board as the turn had already progressed past the halfway point. Too late!
-Only got that "laydown" toward the end of the turn(should have already been laid out much earlier)
-Other arm stuck up in the air like a flag
-Got too excited, sat back up and looked backwards to admire my track, losing all edge pressure AND counter-rotating out of the turn in the process

-need more speed
Much more practice needed.

Many flaws to correct.
But everyone's advice and words of encouragement has been very motivating, it's good to know that there are people all over the world that I have never met in person that want to see me succeed in this quest. I deeply thank you all for taking an interest in my progress
One day, I shall make you proud!

Riding softboots since '96. Saw EXTREME OPUS 4 "LIFTED" in 2010... Back to Square 1