I turned down the cooling fins on a lathe.
I bored out the motor housing slightly
I reinforced the motor mount with a carbon fiber sleeve.
I PU'd the blades.
I bought the 8mm turnigy shafts off hobbyking that are 103mm long, had a new snapring groove cut.
Press fit in new shaft. Shimmed accordingly.
Reinforced top of motor mount with more carbon.
I have three of these. Here is #1 before dynamic balance.