Your 47 MH/s are fine. This is one of my water cooled Gigabyte rigs:

The 25% fanspeed is just a safety feature for my AwesomeMiner. It has 0 fanspeed, because of watercooled. The settings you can see in the picture. Iam using T-Rex with --mt 4 --kernel 3.
I think the speed of your GPU's depends heavily on the manufaturer. I got a few Palits and EVGA non-watercooled, but none of them broke the 43-45 MH/s, even with same or higher settings and with just 50-60C.