Why does my ceiling fan run slowly?
It's also worthy to check and see that the fan itself has its own speed control pull switch at the fan itself... Or possibly some dip switch settings in the fan, like speed options and even possibly other settings like hz. settings... I'm guessing of course, and I may have missed something in your original post, but especially if this fan has a pull chain speed switch in it, the fan itself must be in the high speed position at the fan, especially if you have a wall switch associated with it.