Study 1: Minnesota Transracial Adoption Study
Two things about this study, first, it was discredited: "Due to confounding of social and biological factors, it was inconclusive in terms of determining relative environmental or biological contributions to racial differences in IQ - as the study's result could be interpreted as supporting either hypothesis." Second, scroll down in that study and look at the results. It clearly shows that at advanced ages the adopted black children were out-performed by the non-adopted white children. And to quote you: "It is true that the genetic component of IQ increases as children age.".
Study 2: German IQ study by Klaus Eyferth
This study is so useless and full of holes that the people you're defending would try to fuck it. It was recently destroyed on the main page both for it's non-scientific approach and the fact that it failed to prove that blacks were equal. It shows mixed-race people being only slightly worse off that full white, which is exactly what you would expect.
Study 3: British study of young children in nurseries
From the study: "Observational studies of 85 children aged 2-5 years were made in 13 residential nursery groups.". You yourself said that "the genetic component of IQ increases as children age". I would expect to see numbers such as these on an IQ test, if that's what this were. But it's not. At all. It's a language test.
Study 4: IQ scores of black children raised by white families versus Black families
First, this "study" looked at 23 individuals. 23. Two, Three. Second, this: "Their findings indicate that the black children adopted by black families scored a 104 IQ, while the black children adopted by white families scored a 117 IQ" There's something missing that would shine light on this. White children in the same area raised by their parents. It makes sense that higher IQ whites would utilize better methods and habits with regard to child rearing, resulting in smarter children. If the same study shows white kids raised by their biological parents scoring 125, then we have a completely different view. Let me ask you this, and please answer, if the blacks in this study were every bit as advantaged as the whites, how come their children scored 13 points lower?