Yes, the Versus & mini-LAK & Sparrowhawk are down around 8m^2, while the Silent is 9. Higher aspect ratios and thinner airfoil sections. It all adds up.

I should mention that the Russia AC-4DY, in my opinion, seemed to have equal climb and glide to the Silents. It's a carbon, flapped glider. I understand they will sell as a pure glider for something like 25K dollars! Silent seemed to have an edge on the AS-5M, which was fiberglass with no flaps.