Probably the more important thing is to try and lead with the hips (from neutral to open) before allowing your shoulders or arm to move past neutral, which pretty much takes care of everything you're taking about. The plant foot anchors the right leg and right hip into place, forcing your hips to swing open. The hips should begin to open just as the plant foot comes down. You can add to the hip swing by pushing off your back foot at the same time (or not). The opening of the hips then runs up the length of your torso as your body twists open from the waist on up. The opening starts at the hips and moves up to your shoulders like a twist wave. This ensures that the maximum force and momentum are delivered to your upper body.
What happens before you get to neutral may or may not matter. Blake was usually arguing against a big reachback or turning the shoulders too far back, since the added speed you get going from full reachback heading into the neutral position messes up the rhythm and timing of events. I can see why: if your shoulders twist all the way back, and you whip your arm forward from the full reachback, then they will likely overtake your hips, when in fact it is your hips that should be leading the charge. In this version of the bent elbow technique, the role of that part of the throw involving the reachback to the right pec position seems to be to pre-load your wrist as it goes into the right pec position, and that's about it.
Man, all this talk makes me want to get out to a field and drill! Too bad I have a cold that only gets worse every time I go outside.
Drivers: Starlite Wraith (158g), Gummy Champion Leopard (150g), 1st Run Z-Talon (150g)
Mid-Range: Star Classic Roc (146g), R-Pro Roc (157g)
Putt/Approach: Legacy Protege Clozer (158g), Glow DX Aviar (150g)