Zygon:About your build, I have a few questions:
What's up with the Smothers? DSC being such a menace against our types of decks, I cannot see myself not running less than 4x Swords to Plowshares.
Same question with the Grunts. Do find yourself lacking a big finisher? Or is it against Painter decks that might be rampant in your area?
And finally your mana base seems iffy. I have trouble seeing how you will be able to grab the three basics that you need. I would be tempted to cut 2 Bayou and to add 2 Windswept Heath. Also , but that is just me, I would cut the Petal for an extra ESG

Actually Sundering Titan has been my bane as of late, not DSC. He trumps my mana base and can race for the win if my board position is shaky. I do play 2 extra StPs in the SB but i haven't shifted to all 4 maindeck. Originally, I played the 2 of each to avoid meddling mage and chalice locking down one of them.. I have no problem trying 4 and maybe boarding in smother if needed.
With the grunts: I was finding myself without a finisher more often than desired, or staring down a Viashino Heretic. This was the first time I tried out some grunts and I wasn't displeased but it requires more testing. The anti-synergy with goyf is obvious but I think that little extra beef is necessary (at least in my field).