With all the heat your GPU is producing and 27c room temperature I have to wonder how hot the air going into your CPU cooler is compared to room temperature. Each degree hotter the air going into cooler is makes the CPU same degree hotter. Same applies to air into GPU cooler, etc.
I use a cheap indoor/outdoor wired remote or terrarium digital thermometer to monitor air temps inside my case. Twist a piece of insulated stiff wire into the last 8" so you can bend it to set where you want it... like an inch in front of your cooler.. to see what the air temp going into cooler is compared to room temp.