During 93 and 94, I gradually started pruning some of the low sacrifice branches. This was done to prevent the wounds to become to large and unsymmetrical growth to develop. In the picture, you clearly see that the stump to the right comes from o big branch, it was about 1 m. That branch was causing uneven growth of the lower trunk and roots. I will now encourage growth a little higher on the truck to smoothen out the taper.
The pant, no tree :-), has got a bigger container and a course mix of soil and gravel. In combination with heavy fertilization, this gives explosive growth.