I usually don't use the elemental dignities of cards because I haven't learned a lot about that so I'll add my 2 cents worth without them.
I'm not sure you drew these cards in the order you've mentioned them, with the King first. I think that could definitely change the meaning of the two together significantly.
If the King is first, then he's looking away from the Tower and isn't aware of what's going to happen soon. He's facing the past and as he holds his bowl there, he's offering love, compassion and protection to someone or some situation in the past.
If the Tower came first, then he'd be seen (by me at least) as offering his wisdom and healing to whoever was affected by the Tower incident. The King would be trying to soothe, heal and make sense of the catastrophic event that's happened.
Whenever I get a deck/book set I try to find out from the book what, exactly, the creator had in mind for the illustrations to convey. Sometimes the art differs from the standard meaning enough that you can get a better reading if you've incorporated the artist's intention along with your own knowledge of RWS meanings. The artist of this deck has said the traits of the King of Cups are quiet strength, the wish to heal and soothe, and to be protective, so that's the way I'd interpret the card in the upright position coming after the Tower.