i LST every plant in my garden on the regular & it really does work.
i drill small holes around the top edge of the planter (soil) & utilize pipe cleaners to pull the plant down & pull it apart & pull it this way & pull it that way.
every couple of days shorten the distance from where you tied to the plant & the anchor point.
if i have to make a long connection, i twist several pipe cleaners together by the ends.
in my dwc set up, i attach 3M hooks around the bucket & then use pipe cleaners to do the bondage.
when you pull the main top(s) down far enough over time, that will stimulate vigerous growth ofthe secondary branches ... & they will compete (so to speak) to become the new main top.
and, if you pull too hard, tie down too far, or basically make a visual tear in the plant tissue... paint the torn spot with clonex (on a brush, drip it in the cut with a clean nail, whatever) and wrap a pipe cleaner around the effected area to hold it together... & in a couple of days, viola, good to go.
be fly. stay high.