I guess the question is: Leia holding on defence, is it getting you wins? In Kyber, she tends to be a big offensive tool. Would you win more with her taking out a team on offence or holding a zone on defence?
The other point is, which gives more points in Carbonite top or bottom? And is that the same for 3v3 and 5v5? If you do use Leia on offence, make sure she's defending the side that gives away more points. My guess is that would be bottom, but I don't know for sure.
Also, you can scout. I very much doubt players in Carbonite change their defences much. From scouting, you can form an attack plan. My feeling is, if you can full clear, do it. Then let your defence take car of itself.
I think my other advice for you is keep consistent. By that I mean, don't let the losses (especially the ones that you're way out powered) get to you and just plug away, giving your best every match. That, with your proven knowledge and an improving roster will mean you'll go places.