Thanks for the feedback! As always, there are some picks due to theme or utility...not the absolute min/max for 4* content.
-Rech is without Hasten. The originally posted Mids file didn't have +5 IOs (which are in game), so those should be a wash and nearly perma.
-EndRx in Rad Therapy is because this is a leveling build and it was a huge end drain. Also, ToE end refill doesn't proc like it used to...so it's great when it fires, but when it doesn't, end is a big issue...as you point out.
-Defense slotting isn't "half hearted", because it isn't hearted, at all. Those are just organic effects of other slotting. No specific defense targeted.
-BotZ because 10 pts of KB protection just doesn't cut it with the new updates...especially the FREEM! from Council. 14 (with BotZ) keeps you on your feet for everything but the unresistable stuff (like the Crimson Prototype). Tanks of any armor should never be on their backs (or hibernating, for that matter...personal opinion).
-The Aegis and Impervium psi uniques are both there. Did you miss that fact?
-Nerve for to-hit. Even with double Rage, hitting is paramount. Having said that, I would seriously reconsider Resilient, instead. I use Meltdown constantly, but might be beneficial to have Resilient, perma.
-Fireball? Yeah, no. This is a tank, not brute or blaster. Having the absorb unique (from Entomb - in Char)...along with a nice ST hold and an amazing AOE debuff in Melt Armor (also adding the juicy Achilles proc) far outweighs the damage from Fireball...especially in general or all-tank gameplay. Your "mansion" analogy isn't pertinent, with this build philosphy.
-SJ for function and concept - not negotiable.
Your posted template misses several key pieces, like Power Transfer +HP (x2) and Panacea +HP...they do add up.
You were summoned and responded. Appreciate that....but outdo you? LOL, no-one can out do you, because your opinion is (and should be) the best for you.