Well, it is an interesting subject to me. Yes, if you use too high of a concentration of hormones, you can not only retard your growth, but it becomes toxic. In fact, I believe that many weed killing chemicals are just high doses of IBA, I don't remember the specific chemical because killing plants is not my department.
FYI: there is a special ratio to which you can use cytokinins and auxins at the same time, and achieve the desired result of both shoot and root enhancement, without getting an imbalance. As to the charcoal and the leaves turning white, apparently all the chlorophylls died? Maybe, and this is just off the deep end, you gave them too little light, and whatever light there was, was absorbed by the charcoal? ST
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