if that is in my case, i would just leave it as is, and do the usual process that made it root. In my belief changing the routine, can stress the plant a bit, and if it does not like it, it will definitely go down the fertilizer bin.
In my experience, Phalaenopsis grow slow, and picky with its environment Condition.
By the way, i also have superthrive. I use it also on all my plants. (Misting, soaking, spraying, and watering)