You mighy also want to try Steely Resolve... of course that would mean you wouldn't be able to use Wurmweaver Coil and Gaea's Embrace on your wurms. But it would also save your wurms from cards like Oblivion Ring.
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Try using tribal cards like, Tribal Forcemage, and Tribal Unity. Also, Roar of the Wurm and Vernal Bloom would make great additions to any Wurm deck.
I would like to use Crucible of Worlds, but unfortunately I do not own it.
I too have 4x Forced Fruition, they used to be in my old version of this deck. However, my friends eventually added cards to their decks to get rid of them, so I took them out. Now they can't really do anything to stop me from milling them.
This is my actual deck. My friends really hate it when they're about to win and then I use Glimspe the Unthinkable and Lore Broker to force them to draw.