I don't see any reason to give the rooting hormone when the plants are this far along. I thought that was for rooting clones? Doesn't look like it's hurting any, just questioning why you would need it.
rooting hormone makes for better structure in the roots, it helps maintain good root growth and strength, and the better/bigger the roots, the better/bigger the buds

as for this log so far its looking good man, can i ask what soil/medium your growing in?