I see that you had already answered the question in an earlier post: FDR got 23% of the black vote in 1932.
So black voters did like Ike (in 1952 and especially in 1956) more than they liked FDR (in 1932).
The black vote did not become as monolithically Democrat as it had been (pre-New Deal) monolithically Republican until 1964.
Why do you say that, do you have numbers for the years before 1932?