have you ever considered topping the or fimming? it directs the growth outward for a time being instead of upward like your having problems with.
I agree! if they are the right strain,(and most are!) Super-cropping, tying , topping or FIMing would be the way to get more branching-
but if it is a strain of say- Bubba Kush or Vanilla Kush etc... they do NOT like being topped or FIM'd and you end up with just a crapload of tiny buds and no mains.... you can tie them downward a bit and that may help... but again- depends on what strain it is!