The third scion finally established itself and put out leaves, but not before the first two were well ahead of it. I may need to prune back the other two a bit in the winter to give the late one a chance. Something also ate a lot of the leaves off of the scions not long after they were established, but they seem to have recovered.
Nice, thank you! Great tips! I'll try pinching off the dominant ones now. The bug issue seems to be under control.