And I wonder, and its my position, that you don't have to crank all the way on the HD studs. Even though they may be good for 25+, why would you. Stock being 15-18 ft lbs, I think, being able to take them to max +10% in a consistent manner, knowing they won't stretch or distort is enough to accomplish the goal and minimize the chance of breaking.
I say go to 20ftlbs and it won't leak.
Maybe more if a turbo is involved?