In that configuration, the top one will always be the one heating up, as it's getting it's own heat and the heat from the one below. Three words, Atwood bilge blower. Took 15 degrees off all my amps across the board.
The bottom one is the one I'm having heat issues with.
How them hell do I put a bilge blower in a finished cuddy. Maybe one of the RV type fans. I'm sure my 2 boys would enjoy the cool down as they watch a movie or take a nap.