What I would do instead: Start with two days at Amanusa to get rid of jet lag just enjoying the beach and just relax. Then go from there to Amankila, visiting Ubud and the sights and have lunch at Amandari on your way - making this a full day excursion and transport in one (or stay one night at Amandari before you go on) and spend the last nights at Amankila. Much more of the original Bali nature and culture to enjoy at Amankila compared to Ubud (getting touristy, at least if you do not go on the Amandari excursions). And you will have the possibility of beach relaxation there as well.
You might want to look at your possible arrival and departure details in order to decide upon the order. Might do Amankila first and Amanusa in the end if that fits better with travel plans.