Sounds like a complete need for a redesign (heel cup, straps) from Flow on this binding. Sad to see a product come half baked to market......with so many unanswered questions.
It's more just tweaks. They are just reducing the width of the heelcup. Only the toe strap needs work. The highback lock I'm not sure of. Should be one of those things you need to get used to.
Their new entry system works like a charm. The straps stay locked and are responsive once you are in. The ratchets work buttery smooth and the ratchet lock does not at all impede your quick exit via ratchets when needed. The release tab on the ratchet is also the lock tab. You just give them a small slap down and it locks. When exiting via ratchets, you do the same thing as any other traditional ratchet. They release very smoothly.
By the way, these bindings were super light.