I'm waiting for my warranty period to run out before I get CM into my phone. The photos on stock Touchwiz are fantastic, so I'm sorry to hear that the CM camera messes it up . Is there no way to get the Touchwiz camera on CM? Have you tried third party camera apps?
I don't think you can just put TouchWiz apps on CM, you need to have the TW base framework thing installed. I do use Instagram and that tends to work better than the stock camera app in CM from what I can tell. Not tried anything else since I don't take many photos anyway.