I've always thought that the best way to to balance out the screentime is to have more than two people per scene. If they don't want to copy Vegas with the analyzing over the table (which I don't see why they couldn't do) then they can come up with some other way to have them all together, or 4 of them, maybe somewhere else. For example they could be at a crime scene and Natalia and Calleigh could be looking at some evidence in the living room while Eric is at the kitchen (which is visible from the living room) and H could come it and ask them something. Natalia and Calleigh could tell him about their evidence and Eric could call out and say something about his. That way they could all comment on what each is doing and there's 4 of them in there. There are just so many ways they could have more than two of them in the same room. A break room scene like the one in Dispo Day with Speed, Eric, and Cal is something I would love to see again in the show.