For soloing Hellsclaw just wait a moment until the reflecting dmg buff expires. For soloing Maahes I find bard the most convenient job (silence its petrification aoe, self cleanse paralysis with warden's paen). All of the ARR rank A should be quite fast to solo at lv70 if you know their attacks. I think all of the HW rank A can be solo'd too but you might need to use certain jobs for some of them and have chocobo companion. The goblin in hinterlands needs you doing high dps to kill before its stacking dmg buff becomes too strong.