Hi, Im really not at your level of skiing so forgive me if I say something that's incorrect, this is my first comment ever on BOS.
I am LFF and also experienced a similar pull out to yours. Firstly if I look at your train of thought before you edge out "Weight on the front foot, hips up, elbows on the vest, arms straight, fingers relaxed, handle low, ski close to the wake as possible " Believe it or not but I have exactly the same thoughts before my pull out, only difference I made which helped me was I also think about what my back leg/foot is doing and I try to keep my back leg a bit straighter and the heel down (no weight on the back leg though), I saw a post from Horton somewhere on straightening the back leg to help get more front foot pressure and it has definitely helped my pull outs.
I was probably lifting my back heel a little bit and putting pressure on my back foots toes, causing my hips to drop back a bit without even knowing it.