Replying to Size question!

Stupid question I know...
I have just bought some Fujative 05/06 in the size 179! I am like 175 and weight 75kg. (Dunno your scale, I'm not from the US)!
I am wondering if they are to BIG? I’m going to ski like 75% park, 15% powder and 10% slope! And I am going to centermount them! (7,5 or something like that)
As you properly noticed I have bought them, but I can return them if you think it is way to crazy to ski on 179's!
Well do you?

P.S. what can be won by skiing smaller skies?
hope to get some help