It clear to me that the Supremes don't give a rat's ass for the Constitution -- they do what they collectively want, and then twist the plain words of the Constitution to fit their thinking.
You're right. Even the conservatives on the high bench, Scalia, Rehnquist, and Thomas, are not strict constructionists of the type that infuriated Franklin Roosevelt and his advisors in the New Deal era. They do show some respect for states' rights, are skeptical of social engineering schemes, and oppose the attempts of lower courts to act as de facto legislatures. However, the Supreme Court's conservatives have never met an expansion of Federal or State and local police and prosecutorial powers they did not like.
Rehnquist, Scalia, and Thomas may be the best we can do in the present political climate, or indeed may be better than we can get now given the Democrats' current hard line against conservative judicial appointees. as we see in the Miguel Estrada nomination.