Tighten the drains or fills untill you feel the crush washer 'crush'. a 3/8 drive ratchet is ALL you need.
Practise a couple of times in a vise if you must.
30 foot pounds is HUGE! No wonder they are stripping drains.
Thats steal going into aluminum.

If your really worried about the plugs coming loose, saftey wire them.
It only takes 10lbs torque to crush a spark plug washer.