When I was doing 0.8 consistently, he was getting really low. I tried reducing to 0.6, but that didn't seem to be enough. So, right now I'm doing 0.6u in the morning (when he's usually lower) and 0.8u in the evening. This has been working fairly well, but he bounced yesterday on the morning dose and went low on the evening dose, so I'm not surprised he's kind of shallow today.
I may need to go back to 0.8u consistently again. I'm waiting to see if this clears in the next day before I decide.