Hi GregMartin,
As you have a short season as I do, it is my belief that you should use 2 yo wood and cut 3 yo wood.
If you've got 2 espaliers, try one with 1/2 yo and one with 2/3 yo.
The reason is that some stems will emerge later and won't produce brebas the very next year.
At least, it is my experience here.
You would then probably want to shift the year of production for one arm of the espalier.
It might be that I just don't have the right strains for brebas production.
I bought "Noire de Caromb" this year... I'll see if I get brebas next year, but I'm not holding my breath. In my mind, I'll get them the year after.
Next year, the tree will build and expand its root system and adapt to my locales. But I might be surprise ... Who knows !