I read your post 2x and not really sure what more info you need. I know you are trying to get rid of foot pain, but you have nailed the info on these bindings.
My kids and I have NXT ATSE, M9's, and Fives. We love them. My kids M9's took a little more to set up, he wanted more toe pressure. I got a tip from our local Flow pro. Move the front strap closer to the heel, the front strap has a few different positions you can choose.
I love the power strap as I would get strap pain in my Bent Metal bindings. I don't in the NXT, but you can still over tighten them to get strap pain. I found out the hard way.
I have a ton of adjustments on my NXT's.
- high back angle
- toe strap tightness and pressure
- toe and heel ramps
- padding on base and toe/heel ramp
- metal ratchets, with slip lock so it won't tighten on last rachet down
As for the OP, another negative about Flows is the foward lean... it is adjustable, but you really can't dial it properly without affecting how tight or loose you are in the bindings.
As to this point if you adjust the forward lean and the strap is to tight just loosen the strap closest to you one click. This will give you the forward lean with the exact same pressure on the cable.
It took me about a full day to get used to these. Learning to adjust them takes some time too. I can now adjust them very quickly and nearly blind folded. I mention this because I have a roof rack on my car so I need to fold the high back under the power strap which means I need to reset them every trip to the hill, 2-3 times a week.
I have been riding a lot like I said, anywhere from 1-3 times a week since 1st weekend of Dec. The only failure I had was a screw started to come loose where the toe strap bolts to the base plate and it was only one binding. The other one was just fine. Plus I usually go over them and I have never noticed anything ready to break, tearing or wearing out. SO from my experience the reliability is there.
I hope this helps and good luck on finding a more comfortable solution