After you de-weight the rear, you need to bring your bodyweight much further forward and lower to the seat, in order to get up in the balance point and make it possible to actually roll for awhile on the front wheel... check out Axel Hodges tutorial on this... he explains it very well.
I suppose that knees should be squeezing agains the top-front of the seat.. every time I forget to do that I'm ending up flying over the bar on front brake applied and pop, like I just did 😂
I don’t really squeeze the seat at all I don’t think-I keep my bodyweight far enough back and my arms stiff so I don’t have that unfortunate experience of flying over the bars 😂