According to the most up-to-date calculator (stickied above), you have 0% chance of control the cu sidhe. Why? You don't have enough lore. I'll see if I can find the equation, should you wish to see it.
Equation:
70 + ((Taming difficulty modifier * (displayed animal taming skill - minimum taming requirement)) + (Lore difficulty modifier * (displayed animal lore skill - minimum taming requirement))/2)
Because your lore is lower than the creature's minimum taming requirement, you have a high lore difficulty modifier, which makes you unable to control your pet.