Out of curiosity, did you farm them at the mini spawns (which one ?) or did you use the Quest to gather them?Doing the quest is a lot quicker. You will get enough fairy dust from the pixie champ spawn to get around ten claws from the quest. Remember the quest drops undying flesh as well but the claws drop more frequently . I farmed demon claws to sell them in tens, so I know the quickest way to do it.
Bottom line is, which is the least time consuming way that you found was the most efficient to gather them ?
Thanks.