In any game, you must have a boss that can't be killed by most people.
For those who haven't taken it down yet, it will serve as a motivation to get better at the game.
For those who have beaten it, it will serve as a mark of pride (epeen).
In FFXI, Pandemonium Warden was hard to beat but it was possible to. AV was broken before SMN got Alexander because no group, no matter how good, could win fair and square.
This Ogre has become "farming status" for some LS already (records of <10 min clear of first floor 2 days after release), so there is absolutely no point to nerf it. I suggest looking at their playback videos...watch and learn.
On all your points...
1) Cure MP costs. Though drastic, this is a needed change.
2) Raises need to be on separate timers. This would be nice to have.
3) Stats need enhancing. Believe this is in the works. Anyway, correction to your claim. Only VIT and MND has a very noticeable effect. The other stats work more silently.
4) Gear damage from death needs to be abolished or reduced. This is a good gil drain from the game.
5) the r45 dungeon needs a slight nerf. Watch videos and learn...
6) Enmity needs to be fixed. Can't comment.