Just give me them lots of light the more light they get the more nodes they get, also somewhat to do with genetics I believe. I kept my light a little closer when they were small then raised it to help get some height. I didn't clip any leaves off mine till a few days ago , just some larger fan leaves to let more light into the middle. Hope this helps.
Week 7 update sorry a little l8 on this one been really busy. Clipped some of the larger fan leaves off a few days ago. Been having prob. With the right one but she's not looking too bad.