Agreed with the above posts.
Also, When was the last time the clutch was completely serviced? New spring, bushings in the weights, could the weights themselves be damaged and binding? If you can figure out why your clutch is getting so hot, you should be able to get it to cool down without any more vents. Motor mounts like mentioned above could be a big factor, have you ever pulled the motor and had a look at the mounts (front ones especially)? Do you have the SLP torque arm or torque stop? How does the factory torque stop look? If it is mashed out you probably need a new one and new motor mounts.
That's the thing about the 9s, a simple little problem could be a lot deeper than you initially think.
Anything more you can tell us? Someone might be able to help narrow down your problem a little bit more.
Good luck