I wouldn't bother with keys. Any M2 cobalt gear is far better than the sentinels and it's probably much more time efficient to farm the gil (if you don't have it) to buy them then camp those stupid chests. Even the mage stuff stucks while magic acc is the most desired trait next to int for any high level NMs.

I do agree ifrit/moogles are annoying. I'm lucky and I think after 6 wins I'm up 3 totems and a bow but I know far more people that have won three times more than I and have nothing to show for. Needs to make totems 100%. No reason not to. If you can kill ifrit 10 times you deserve a weapon of your choice.