No. It's very difficult to appeal what goes on in the jury room, unless you know racial bias or something like it occurred. Any conviction would have been appealed, the full conviction just makes it more durable, absent a full mistrial (looking at you, Maxine Waters).
Not how it works I believe. He can only be punished for one, but if only one gets overturned on appeal (usually from a technicality), the others stand, IIRC. Even if he does get punished for all 3, they'd be severed concurrently, not consecutively, which means he'd serve no extra time.