I do not trim a lot either, but I think if you took off some of those large ones around the top, there is something I noticed starting when zooming in a lot. Do NOT go by what I am saying, but I would put it back in transition. I really am not sure, but I think you need to see some kind of budding at the start of flowering or at least with mine it did.
I am using an auto too and used the wrong recipe at first. When I switched it, it started growing better.