Marshmallow Fluff Help

I am attempting to create a recipe for a cake, and for it, I need to have a tunnel of marhsmallow fluff in the center of the bundt cake (like the tunnel of fudge). However, every time that I try it, the fluff is so light that is constantly rises to the top.

Now, without giving the recipe idea away (it's under wraps until I can get it better perfected and in to the contest..and then I will forward it to anyone interested), I can add chocolate to it, but I tried putting a layer of chocolate fudge over it, and it still didn't help.

How do I keep it weighed down? Would actual large marshmallows work better?

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