I don't think they do like full sun at all..well not when its hot...and I've noticed lack of roots on sunny side of the pots so now I always put something to shade that side and stop the compost going too warm.
I've now some naga morichs that are happier in house where they get sun only a half of the day..as soon as I brought them in they started to green up and put some lush growth on again.