The one thing that i did was also compare the value of endurance vs defensive stats once you get into that 1700 and 1800 bracket. Even with the DR getting that high on my shield and absorb, it still beats endurance in the 1700 range but by the time you're getting into the high 1800s it becomes more debatable.
Given that Endurance doesn't actually affect survivability for a powertech, I'd be curious to see on what grounds you were comparing them. If your goal is to minimize healing required, endurance will never be the best stat for a powertech, since it only serves to provide a buffer. This is distinct from a shadow/assassin, where stacking endurance actually increases survivability (decreases healing required) due to the self-heal mechanic.