By Evan Dawson, Finger Lakes Editor On a recent visit to Rooster Hill Vineyards, owner Amy Hoffman said something that got my attention. The new Rooster Hill Dry Riesling has .8% residual sugar, or 8 grams of RS. Their dry riesling used to have 4 grams. There's a reason for the change. "Our experience has shown that .4 is a niche product," Hoffman told me. "There's a much wider and more accepting market when your dry riesling is at .8." Today my colleague Lenn Thompson reviewed a Finger Lakes dry riesling that received one of his highest scores: 91 points…