Just for info, about three weeks ago I transplanted several plants from 3" to 6" pots. About half were put on 12/12, and the others on 20/4. The 20/4 group were watered with a transplant solution and the 12/12 group with a budding solution.
This weekend I transplanted all to 5 gal pots, and the 20/4 group had better roots and growth. IMHO the transplant solution was very benificial.