Nitrogen triggers a 'grow leaves' response.
The reason you have heard ST is good for rooting is its use as a transplanting solution. The thiamine in it helps reduce shock to the plant. But that is for plants with established roots. You need IAA or IBA or another root hormone, and plain water, and rooting medium for the basics. You can get fancy with cloning solutions but I'd go with the hydroguard in the cloner and cuttings dipped in dip-n-gro for the highest chance of success. Don't forget to monitor your water temperature.