I have a 2014 MacBook Pro and while Volta helped, the next best solution was to replace the thermal compound — I used '''Thermal Grizzly Kryonaut''', works awesome!
Additionally, you can use thermal PADs on the radiators to suck a tiny bit of heat out to the aluminum body. The MacBook case makes a great heatsink. It definitely spreads the heat out and the bottom can be a little warmer, but the system itself can run a lot stronger!