The Absent Silhouette battles always struck me as being about forcing you to learn certain mechanics rather than being about a raw contest of stats. Nothing in vanilla KH2 really requires you to use Reflect or Guard even on Proud difficulty. Not saying it isn't annoying, but also, generally you don't want to fight any of the Absent Silhouettes as early as possible. I'd wait until after Demyx/1000 Heartless/et cetera and then you'll find it a good deal easier and have many more tools in your repertoire.
Maybe but that book attack with them all flying at you and stunlocking you in the air is still cheap :/
But yeah guess I'll come back later