Week 10 through 11 is certainly the best time not doubt, I,d run out of height I had no option with one plant and a couple of other shoots, at the end idk about the couple of other shoots I didn't pay that much attention but one that I hammered yielded roughly 2x the 7 others, that could be for whatever reason idk nor pretend to.
I've not got the balls to try again unnecessarily and doing a branch or two didn't have the same affect.
I seem to recall taking out the growing tip early flower giving you two buds of approx half the height of regular top, it's handy for limited head room.