Nice start.
Since you already have decent trunk thickness and you have it in a grow box I would not "
plant this out in the garden." Instead, I would let that main leader grow unchecked until it reaches a thickness that matches the main trunk better. At that time i would chop back the height again. Your pretty close as it is and the foliage most likely covers that area anyhow.This being said without knowing how your nebari looks.
11 years in training?
Save me the truffles
Will