I have no doubt that you WILL achieve your goal if 5oz. I would venture to say closer to 8oz is a more realistic amount. My best from autos was 13.83oz dry/cure from 3 sweet seeds cream mandarines. 3gal smart pots, soilless, technaflora RFS, 400watt 18/6 perfect environment. Keep In mind I have quite a bit of experience to make that happen.That yield is not typical from autos but I really pushed them, because I can.
So, what did you use to raise your pots closer to the light? Just curious.
Do you have a pic if these "oily" leaves you speak of? Maybe I can help, maybe they don't even need help. Maybe I just wanna see em. They are kinda like my nieces.