Root work/cutting the tap root, as well as wiring, will most certainly slow down growth for a time. Still, these are necessary actions to carry out early on. The goal is to wire out younger more flexible stock, like your seedling, because you can create more significant bends as now as apposed to later when the plant has grown on and is significantly less flexible. With that being said, I'd actually try to put more movement into your seedling now, and do it in both side to side and front to back directions... pro tip... gently twist the seedling and the wire at the same time, in the direction that the wire is wrapped, while you gently create bends.