My father was in the fastener design industry for 30 years and he always told me to trust the torque specs, whether I think it is too loose or not. They are usually well thought out.
Then he would know that if you switched the type of mounts the specs are not 'in spec'. Also, if a bolt or nut is not 'perfect' the specs will be off. Usually they are not tight enough because the torque wrench will sense the friction of not perfect threads. My 'big bar' technique comes from having subframes move over time. They need to be as tight as you can get them(without ruining the soft part of the mount).
