Instance drops.

[Chamsin]

Running the same instance over and over and over again. Without the one drop you miss is dropping. That is starting to look like scamming. What about fixing the drop chances so all things will drop. At least one time every 10 instances?

[Master Blade]

The drops configuration seems to be all good, some of the items have relatively lower drop rates compare to the rest ones, so it is just a matter of time plus a little bit of luck that you will get them as long as you keep trying. Good luck!