In my view, I'd keep Langford De Colo obviously, James because with luck he will give you credits (and you need them), and Young/Rudd/Schilb because you cannot easily find better players within that price range. Schilb and Rudd play plenty of time and are ok choices.
We are left with Zizic, Doellman, Datome and Wanamaker. From these, Doellman and Datome should definitely go if you can. Problem is, you don't have credits. This is where I would suggest you change Wanamaker. Wanamaker is on form, but in your case, you need to get updgrade some of your players elsewhere, so you need to find someone cheaper that can play as good as Wanamaker.
I have only two suggestions, taking into account the double game week. First is Doncic and the other is Fitipaldo (for credit gain, plus Galata plays Maccabi at home). Doncic should be a much safer choice (Real play Armani at home on Friday).
If you buy Doncic, you save 10 credits. If you buy Fitipaldo, you save 40 credits.
Buying Doncic will allow you to change Datome for Papanikolaou (better chances for Papanikolaou against Armani, but only slightly better) and Doellman for Faverani (hopefully with some credit gain).
If you buy Fitipaldo, you risk getting less points compared to Wanamaker, but you can buy a good expensive tall guy for the double game week, like Jankunas or even Brown, and perhaps one less player to really worry about, or a good expensive SG/SF, like Spanoulis or Goudelock. You can even bring in two medium players, like Tuys/Vesely/Tomic say and Hanga/Lojeski/Bogdanovic. It depends how you want to go.