Ok, for those trying to get one of the two characters unlockable by getting expert staff ghosts, here is my all essential tip for you guys.
Play the staff ghost, beat it. Then, play the ghost that beat the staff ghost, and repeat the process. You will gradually get better, because you are competing, and competition brings out the best. I know this seems like a simple tip, but I got so frustrated trying to beat the staff ghost, because it didn't give me a threat.
Please don't say this tip is dumb, as I'm sure this could help those who need help with the expert staff ghosts.