Just so you know. You seem kind of bowed up and proud of your mod like you've done something original, hence the criticisms. I assure you there's nothing original here except the platform you did it on, and even that's been done before.
Having said that, what you are actually doing is creating danger. Your obvious lack of expertise in RC is showing. You show a total disregard for the fact that not only one propeller, but FOUR are now greatly out of balance, thus creating a potentially dangerous situation for you and those around you.
Also drilling a hole in the hub is a BIG no-no. Ask anyone that was around in the early days of the 350QX how a weakened hub works out. You have jeopardized the structural integrity engineered into an already weak design to begin with (THAT is the nature of plastic RC parts and beyond your control.).
These are just facts. They are not personal, but we have a fiduciary responsibility to expose potential risks so others realize the potential jeopardy they may cause, and that's exactly what I'm doing here.
It's like a lot of things. It's cute until an accident occurs. Then it's not so cute anymore.