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I'd raise your to 24" inches above the canopy.. Not the floor. And crank it to 90-100%. I don't see any tacoing.. Tacos look different. You've got a lot of light power you might as well use it especially with autoflowers as the growing cycle is shorter so the more light the better. Your plants might get a bit cranky from the changes in light levels.. But they should be fine with the light at that level..
Unless you have a PAR meter, I don't recommend using the dim settings. Your babies need about 600 ppfd right now. Look up your light on Amazon or somewhere else. They should include ppfd maps to help you know what height to place your light at.