Your team looks pretty good but you're probably disappointed in some of the guys like Wieters and Greinke. I would drop Wieters, unless you're set on naming him a keeper. I think he's had enough time to prove himself and I actually just dropped him in my league last week. The Orioles are convinced he's got a bright future and he did get hot in the second half of the season last year, so maybe you want him as a keeper. Greinke obviously has a terrible record but I wouldn't do anything with him. He's right around a hit per inning, decent ERA and a great K/BB. He's just got a bad team behind him. Nolasco, Werth and Heyward have struggled recently but definitely solid players who I wouldn't part with. Latos and Anderson are great young pitchers. Despite the injury this year, I'd especially hold on the Anderson as long as you can. He will be one of the best in the league in a few years. Same goes for Carlos Gonzalez.
Overall, I would say you don't have much to do with your team. The talent is definitely there with guys like Kemp, Werth, Prince, Utley, etc. Even though some of your team has struggled, the numbers will be there in the end.I'm in a similar position as you with my team as well. Believe me, I'm dealing with Teixeira right now, you just have to know the numbers will be there.