Just gotta say. Candlestick keeps are terrible.
It's not so much that they are extremely difficult when compared to other dungeon types, but they are extremely difficult and offer no additional rewards or incentives. In fact the giant ghosts in the dark hallways, which can't be defeated, and will take half your life with a single bite, provide no reward at all.
More and more, I notice groups of knights preferring to simply wait at elevators for them to pass. It really kills the flow of the game. SK was a better off without Candlestick keeps.
So in an effort not to be all negative criticism, with no solutions. I'd like to suggest either keeping things the same, but doubling rewards from bad guys in the C-keeps, or reducing the damage done by the dark hallway ghosts to about 25-50% of their current power. Neither solution is perfect, but it adds a little sugar to this otherwise bad medicine.
B-but... The atmosphere...! It's worth more than some silly ol' crowns and heat, right?
... Right?