Have you tried bathing at a different time of the day? Sometimes it's too OS before bed if they're already on the way to being tired....which then gets them worked up and a bit OT feeling and just grumpy. Also, no matter how not cold you think they are....they are. DD can tell me now that she's cold...and our house is warm and I get her into her PJs right away, but she's still cold right after her bath. She tolerates it now, but she was a crier when she was younger. I think that was partially the reason. I'd try at a different time of day just to rule out that it isn't TOO much before bed but if that doesn't help...then just be resigned to the fact that your LO needs to get warmed up, snuggled and cuddled before calming down after a bath.
Best of luck!