Which mounts are most importing for torque motion front to back?
Window Weld FTW
There are a lot of write ups about filling your mounts. Google, or search here.
As for what mounts handle torque, you need to address the rear (trans) mount, and the 2 smaller front mounts.
Odds are mounts 12 and 13 are either shot, or have been removed, and 8 has probably seen better days. You can get a full 5 mount repalcement set for around $100 and fill them with 2 tubes of window weld, or if the engine and trans mounts are good just buy a good solid set of torque mounts (maybe get an insert for the rear trans mount).
Replacing just the torque mounts will keep in car vibrations to a minimum, but resolve your issue... and probably some other issues you may not be aware of.