Why does Reality Smasher bother you when you have six main deck answers in the form of Tarmogoyf and Baleful Strix? Fatal Push is a a great add to this deck. Shardless is favored against Eldrazi anyway, this pushes it over to us even further.
I agree, Strix is good against Smasher, though hardly an answer when they just Warping Wail it. In my experience Tarmogoyf is pretty mediocre against Smasher. Most of the time it's not big enough to win a fight with it.
Maybe Eldrazi players in my area are just luckier than average, but it certainly doesn't feel like a significantly favorable matchup for Shardless. I do agree that Fatal Push helps, because if you top deck it after they cast Thought-Knot Seer you can at least kill that... unless they have Chalice on 1. The more I think about it, the less it seems to help. Dismember is probably just better in the matchup.
Quick question about mana bases. I'm running a pretty typical Shardless list but I only have 2 U-Sea, 1 Trop and 1 Bayou. Would I be better off filling the gaps with basics or shocks? I know the deck is pretty color hungry so I was leaning towards shocks but I imagine getting a shock wasted must feel pretty terrible.