I did read your post carefully. But it's not clear what you mean by 'move the seat forward'. If you mean, move the entire seat closer to the screen / foot recess area, then yes, I agree that is not possible. However, you can get the lower leg support to flip up all the way so you can rest your leg on it at any angle from the ground, including flat from the ground.

I haven't been fortunate enough to try any competing angled lie flat products, but I think the criticism of the UA product is a bit harsh. It seems on paper to be equivalent in design to most other carriers' 180 degree total flat products, except for the width where it is indeed narrower than several other competitors. If you have tried and prefer other carriers 180 degree total lie flat products, you could provide some specifics about how it differs for our edification.