Hm, I was looking up Optifine just now and the download that I found had several comments saying things like it was making their Minecraft laggier than without Optifine, that the grass had grey sides, and other comments like this.
Perhaps the most recent Optifine just isn't a good version of it and has some bugs that need to be fixed, that's the only conclusion I can come to with all these complaints I read, and that you've repeatedly been sure that you've done it correctly multiple times.