Nice capture. I must admit I thought the images were sharp as a knife and wonder if it's your browser. Just re-looked and they certainly look fine to me. I can't imagine the church being sharper.
I check all my RAW images in Lightroom4 and if any really appeal I leave them at full resolution. The others I choose to keep I downsize to 16MP. If I want web images I retain the resolution of 240 ppi and resize the longest edge to 860 px and then save in sRGB at above 150Kb. My web site help team informed me that saving below 150kb can lead to odd and poor looking images. So I guess you are doing about the same as I do except your image size is larger.