MAte im not much of a fimmer/topper, but ive seen bushes first hand, really well done many many tops. The best advice i can give from my observations are top/fim as much as you can as often as you can, healthy plants bounce back really fast and pump new growth. The reason is so that you can flip the switch ASAP, as all this new/vertical growth is wasted time and energy if we are lopping it off. Get them big and wide sooner. And the SLH will reward you with a big stretch and long glistening colas
Theres a little bit of an art to it and it comes with experience. You can top/fim randomly or some will do 2 topping passes then FIM etc. You will get familiar with what works best, especially if your using the same clone again.
And if its not fimming/topping then its putting more plants in to fill that space sooner.
Growing tall trees is better with vertical lights.
Theres many good ways go with what feels good and have fun
peace mate, keep it up
slh