Help With E-Brake Rattle (MGW Shifter)

I installed the MGW short throw shifter, and as recommended did the dynamat fix to the e-brake...but it didn't help. I am getting some awful rattle when I accelerate. I even took the console apart again, and added more dynamat, but it didn't seem to help. Well, at least I think it's the e-brake that's rattling.

Any help from guys who have this shifter? Also, does anyone know why it rattles? That might help me solve the problem.
 
I'd first determine if the rattle is coming from the e-brake. While accelerating, have someone squeeze (don't pull it up!) the e-brake when the noise starts and see if that stops the rattle. If so, take it apart and add more dynomat. If not, go under the car and make sure nothing came loose. Locating squeeks and rattles is sometimes difficult. Noise has a funny way of traveling.