At this point, I would think supercropping it may help. You can really get space quickly that way. From what you said, the plant is in danger of burning up in the lights. Nothing to loose in my estimation.
Auto’s are traditionally a not clone or trim at all because it would shorten the growth time. @garrigan62 has a study grow going right now on Auto’s and Cloning. Will be interesting to see what becomes of the study. Here is the link