[sAmI]

So you mentioned that Rocket League and CSGO does not heat your GPU much it is because that these games are CPU-Intensive and uses CPU Alot as compared to GPU. And looking at the game specification required it seems that Destiny is a GPU Intensive game. So my best bet would be to check out thermal or firstly do a kombustor to see your GPU temps. Since its a laptop maybe also check for AirFlow or use any fan cooler for laptop i'm not sure what are these called. You got a really decent laptop there though!