Wedding Cake Tree

We have a Cornus Controversa Variegata (Wedding Cake tree) but its main leader was broken before we got it. We have trained the strongest branch as the leader but the tree is not gaining much height. Should we leave it alone to sort itself out or continue to train up a branch. The other branches are all growing to the side, as they should, but we are not gaining much height. Grateful for any advice. Margo

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