Your plant is looking great so far and the light distance and dimming is on point. Just a heads up however, you're going to have a problem in the future unless you get a taller tent. I am by no means an expert but I always LST the shit out of my plants and even my shortest auto right now is 52cm in height (including the pot). And that is with constant LSTing.
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I have no experience with your light but I had problems when my light was 12inches from the canopy. My light was a 240watts QB and the tip of the main bud got bleached, because of too much light. Your light being 120watts means you can shorten the distance a little bit more but in my experience, shorter than 12inches is too much light (but once again, it depends on type of light, watts/ppfd).