That looks normal to me.
While fertilizing before the leaves 'harden' does no real harm to the tree itself. It does promote the leaves to grow larger (which can rune a leaf size reduction) as well as promote new growth to have longer internodes. Mainly and especially with fertilizers containing Nitrogen.
Just curious -- are you keeping this indoors?
my tridents are also just leafing out (and initially appear wilted until the leaves harden off).
how long have you had the light set-up running?
Very nice setup indeed! I think I might try to build something similar while all my trees are outside for the growing season.
I only asked because trident maples are decisuous and need to be outside for the winter. Did you just bring the tree inside early? I guess I should also ask where you live.