You might be trying to hard to get there. If you are not growing outside and waiting for flowering to start naturally you could put the plant in a 12/12 light schedule indoors sooner rather than waiting until the plant is getting overgrown.My issues it that they get so big and with so many branches that its impossible to keep LST as you run out of space and the only way is to keep letting them grow sideways, but they'll grow so far the branches will snap in flower because they're long and thin.
I would like to make plants with short, very thick branches with big budding sites.
How can i do that? Topping and LST doesnt seem to be enough...
Maybe always cutting new branches and just leaving a few to develop?
Including proper doses of silica during the vegetative stage is often recommended for stronger stems. Adding some Cal-Mag to the feeding schedule might help a lot.