You don't want both a dead perch and a panhard bar. Use one or the other. The dead perch is less cluttered.

Whoever told you that you need it in addition to the panhard bar is out to lunch.

There's an explanation here.

http://www.sachserodshop.com/pdf/15.pdf

The dead perch has nothing to do with bouncing. That's the job of the shock absorber.