Holly…that is a super nice looking espalier! I really, really like it. That tree is going to make a ton of apples. I’ll post a pic tomorrow of mine, it’s never been pruned (at all, aside from removing one root sucker) and is in it’s 3rd year since planting here.
I know nothing about espalier, but if it were me, I’d allow one more set of laterals at the top, spaced the same as the others. That would allow just a 1’ leader on top with the top tier laterals and leader all reaching exactly the same height. To me, that would be the most efficient use of space and also the most pleasing to the eye. I would only cut the laterals to remain even and in balance. There definitely is no need to prune to encourage fruiting with this variety as it wants to make WAY, WAY too many apples already.
I’d bet anything that it fruits next year, but if it doesn’t that might be good for getting the tree a little more robust in the meanwhile.