I was soloing T+ crabs on my WAR having 3 regen atmas on. You might have to deviate from the norm some to allow something, but the ability's there. No Utsusemi or Seigan/Third Eye was involved.Can you solo them?
More specific to the training idea, an old thing I had in the past that was in any city you could enlist in a program where, for every hour you're offline, you can maybe get 1-3 levels in a chosen skill. When you log back in, you just pay a small gil fee and the skill ups become official. Going out in the field should technically be faster, but for things like Guard and Parry, this would be a godsend.