Just have to say as a level 22 SD/SJ tank, endurance is definitely a problem. So much so, that toggle-juggling is becoming a norm.
I have Stamina slotted with two Level 25 EndMod IOs, and fighting with more than three toggles (generally run DEF/BA/Cover in groups, and sub out AAO instead of cover when running solo, plus Combat jumping) has me popping blues as if I were an SS tank.
I'm not driving toward max level with this character, but I cannot imagine running tough/weave with this build as it stands, even with fully slotted IOs in Stamina.
Edit: I've slotted a third EndMod as well as one EndRed in each of the toggles, and the stamina drain is a bit more manageable.