Should I top my LST'd plants, or leave them?

Depends on the space you are trying to fill. I top for other reasons too.. it slows a dominant branch down a tad. it helps increase density of vertical shoots in an area... all good reasons... have a reason to do it. Make sure there's enough time afterward that it doesn't diminish yield. If it can't be a strong vertical shoot even with canopy by the time bloom is in full effect, it's not worth it.