On the immaculate bird boss I feel like you should've mentioned the two skills that help bypass his damage resistances like (Perfect Strike) negating 100% resistances or (Moment of Truth) that ignores 50% of resistances. I made short work of that one with baiting out an attack with Pommel Strike, inflicted Pain from Perfect Strike, then finished with Moment of Truth.
Ya and I forgot about the elemental vulnurability which helps too. I was too focused on the fact that his heath was so low and his resistance so high. Very odd boss that just dies instantly if you have any raw damage.
These three are definitely on the weaker side. They don't have very many abilities ether which makes them pretty easy to read. Very cool designs though.