We are not completely sure the X11 algorithm is the best one to use right now. The fact that GPU's run cooler on it does not mean it is more efficient by any means. It simply means the existing X11 mining software code is not optimized and is not fully utilizing the GPUs hashing power.

We also have a strong belief that there is a private miner out there fully utilizing their GPU's with a custom coded miner gaining mining advantages over every one else. And if there is not, there will be one shortly.

A similar thing occurred when people first started mining Bitcoin with GPUs.