Just got through testing some tonight against a friend playing Esper, and wow is Sinkhole a great sideboard addition. I still hate having Tombstalker hit by Swords, but other than that this deck is just crazy good most of the time. I won 10 out of 16 matches using the most popular list:

4 Goyf
4 Deathrite Shaman
4 Delver of Secrets
2 Tombstalker

4 Hymn to Tourach
4 Daze
4 FOW
4 Brainstorm
4 Ponder
4 Abrupt Decay
1 Dismember
1 Sylvan Library

For my sideboard, I am going with

4 Sinkhole
2 Disfigure
1 Darkblast
2 Krosan Grip
2 Submerge
2 Tormod's Crypt
1 Umezawa's Jitte
1 Life From the Loam

I really just feel unsafe without at least 2 dedicated graveyard hate cards in any sideboard. Shaman does a lot of heavy lifting, but I still love my Crypts, call them my security blanket if you will. Loam, Sinkholes and Wastelands just wreck strategies, I do love me some land destruction. I had previously tried to run Bobs instead of Tombstalkers, but it is clear that Bob is just not enough pressure for a tempo build. Bob is just better suited to mid-range builds I think. The one question I had about the mana-base is do we have to run Tropical Island? I almost always want either a Bayou, or an Underground Sea. Can this deck run 4 Underground Seas and 3 Bayous as it's lands? We still have 4 blue sources for Daze, is this enough?