Tough, weave or both?
Having too much defense is like being too rich. My SD tank has Weave. I needed it to get him above 50%. Too much? Sure, until you go up against Cimerorans.
Paragon City Search And Rescue
The Mentor Project
The thing is, getting defense to stack with Weave is easy. A single cheap IO gets you an extra 3% defense, giving you a total of 10% defense with Weave. That's about 20% less damage.
Mains (Freedom) @Auroxis
Auroxis - Emp/Rad/Power Defender Pylon Video Soloing an AV
Pelvic Thunder - SS/Elec/Mu Brute
Sorajin - Elec/Nin Stalker
Neuropain - Sonic/Mental/Elec Blaster
I'd say you do NOT need Tough or Weave, but they are both useful. On an SD Tank you shouldn't need Weave, softcapping should be possible without, but if you can spare the slots and the endurance usage I would recommend tough.