Has anybody used the roots organic 707 mix vs the regular roots formula? If so, which one did you like better? From my understanding, the difference is that 707 has soy bean meal, kep meal, and coarse peat while the regualar roots has leonardite, alfalfa meal, green sand, kelp, and peat moss. I also noticed that this soil recipe seems to lack an amendment for potassium (K). Anybody care to comment? I know green sand and kelp have a lil bit of K but is that enough?