Do you mean that it is actually sitting on the sub frame? If that is the case, you need to re-torque the bolt and use blue thread locker. If not, and you have already blown the new mount's rubber restrictor, then I suggest going to
McMastercarr look for 8644K18
Flexible Urethane Casting Compound 1 Pound Liquid, 94 Shore A
$ 23.51 Each
Pull out the old mount and fill it with this urethane casting compund and you'll be set. Fill both front and rear mounts and get way better throttle response.