GregorMendel

This seems odd. What is your cpu on the macbook? I'm running the i5 series and see no heat issue. Also, what area is the "back-side"?

Where is your pineapple in reference to your connecting client? Also, are you attempting to connect in a "regular" fashion, or a "karma" based way?

Is the minecraft server still up?

Is it too late to get in on the Quake?

I think you may get better results with the aforementioned Aircrack based "De-auth" attack. This would allow you to selectively target the MAC addresses you want, while not jamming yourself. This can also be achieved via a "Piggy-back" another monitor mode wireless card attached to the Pineapple. For best results I like to separate the "evil-twin" from the "Jammer".