Well extending duration means 1 of 2 things.

1. Change nothing and extend duration. OP as fudge. 10 sec duration, 25sec recast, same heals/damage jesus no.
2. Nerf it to extend duration because of #1. 10% mit and 25% healing nerfed anymore will be functionally useless for tank busters and there are not many situations where it is advantageous to have more, slow/weak heals/mit over time than when most damage is highly bursty.

So, its just a bad idea overall. The only gain is for making it closer to old bloodbath in dungeons, which as i mentioned, is wholly unneccessary when war is already the best (functional) sustain tank in dungeons. (pld can sustain more but at the cost of 0 damage which is why i say 'functional').

I didnt say anything about self targeting. I wouldnt turn it down if they gave it out, but its also not exactly the top of my list as it only affects soloing things that can kill a tank (niche), and 'everyone is dead but me on this dungeon boss' situations, which are highly, highly niche situations the way this game is designed. I wont loose any sleep over those.