What does he get for physical and mental exercise? Some need more than others.
It's funny he doesn't chew the baseboard in the daytime. Makes it harder for you to substitute an approved action. Is he not alone during the day? Sorry, only questions, no tips. Except, I'm not a fan of crating, but is a HUGE crate possible? Or even better, a sturdy pen with room to move around in but away from the walls?