If your at 12-13% BF, then right now its as good as it gets. Actually, not bad for the BF your currently at. Although, depending on genetics, some people "show" more and some "show" less. Diet will be the key to this. I'm sure you've heard the expression "Abs are made in the kitchen"? Well, it's true.

I can tell you that I hardly EVER train abs directly. Compound lifts, heavy lifting, they all work core just as good.

Just my .02 cents though.....