Mike, thanks for the comment. This is a bit of a challenge for me because I’m training the trees as they grow out one year, then cutting off a cordon to graft onto the next year. In some cases this year I grafted onto the main center vertical, with the idea to grow the tree onto the upper trellis wires as the new variety; these will get as much vigor as the tree has to offer.
The other two situations are on espaliers which have horizontal cordons, and one with 30 degree or so angled up cordons. The angled up ones should be ok on getting vigor probably, but I’m sure what to do with the horizontal ones. Since I grew last year’s limbs out along the wires, of course the pieces I want to graft into are now horizontal. I suppose the best thing might be to select shoots 10cm or so below the wire, grow them up at 45 degrees with no bending. Then the next year cut them below the wire and graft there at the 45 degree angle. Then when the scion starts growing it can be trained to the trellis.
If I didn’t mess up the grafts too much (see discussion with applenut in this thread), I suspect they will grow ok since they are near top of the tree and fairly close in to the leader so probably will get enough mojo. I’ll definitely let you guys know what happens with these.