Thanks for the update - the tree looks great! I wouldn’t worry at all about the position in the pot, it looks fine as is. Removing those roots that were sticking up helps - I’m glad you were able to get to them.
As for the heavier roots below, it’s OK to remove heavy roots as long as there are still plenty of fine roots coming from other spots. And if you left them all, that’s OK too as they can be reduced next time.
You can start feeding the tree in about a month - I expect new shoots as soon as it warms up a bit.