Yes, you are been too eager. First, don't go changing the light schedule over and over, you risk the plants going hermy. Second, the plants can flower only after reaching sexual maturity, when they grow the first preflowers (pistils or hairs), this usually takes 3 to 4 weeks, so changing to 12/12 this early will achieve nothing, except slow down the plant development since now they have less light hours every day to work with. Even more, after changing to 12/12 it usually takes a week for the stretch to really take off.
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