Arnie

Sounds like things are pretty good with the root system, personally I wouldn't have removed so much of the old soil (unless it was clearly holding stagnant water and rotting the roots) and would have invested in a bigger pot until it recovers. But it sounds like you did a careful job of it.

Water quiet lightly for a few weeks and keep in the shade - no food.

This stimulates the tree into forcing out more root in search of water and nourishment.

Superthrive - you'll find very mixed opinions on this one, some think its crap, some swear by it. I use it and think theres something in there that helps and aids recovery....probably some vit B1. If you have it use it....but again keep it light, a drop per gallon.

Good luck, you,ll probably find that Trident sending out lots of new growth soon.