I use hex and torx with a 1/4" drive socket ratchet. Its shorter than my allen keys, but still enough to cause some harm. The trick is to wind it up and stop turning the moment the threads get stiffer. Then you can feel for it going tight. Turned until it wont go any more is too much on any normal bolt. Something into a plastic body is tight enough when the item isnt moving and the bolt doesn't feel like it will unscrew itself. Into metal, feel for the spring as the threads begin to bind up. Dont keep going until it locks solid as the next point is a broken bolt/thread if that hasnt happened already.
Stainless is always fussy. There is virtually no spring in the threads and the metal self welds. Thread lock is a must have, but the liquids mess up any torque values. Another reason why I prefer to feel for tight enough. It also reacts with aluminium but thread lock helps to seal out the weather and avoid seized threads.
