Veg, think of it like constructing the frame work. Buds can only grow on future frame, for now just let her grow.
I just find it's never worth the stress to top, top and top, you can literally just let her grow vertically for 5 weeks and bend her over to the ground, this breaks apical dominance and will give you the 16 stems without the 5 weeks of stress recovery.
5 or so weeks of growth, with a 2 week plant (in terms of mass).
Good luck.