Trying to breed for hidden abilities HELP

heres my situation. so far i know its a bit easy to get pokemon with hidden abilities in the friend safari. so i get a male and female clefairy with friend guard, so i can get a cleffa with friend guard. I thought the chances would be better than 1 cleffa per 30 or more eggs but apparently not. Im just wondering if im doing something wrong since i thought the chances would be around 60% with just the female.