Were there Constitutional principles of liberty at odds with other "principles of the Constitution", the latter yielding " 'exceptional' property rights " of slave owners?
>>> Are there principles superior to the "principles of the Constitution"?
There should be no conflict between the "principles of the Constitution" and any that you might personally believe "superior".
If you see such a conflict, perhaps you should re-examine your concepts about both. -- I've heard that military Chaplin's are very good at explaining how duty to our country & Constitution can be reconciled with an individuals personal beliefs.
Were there Constitutional principles of liberty at odds with other "principles of the Constitution",
? -- That line is nonsense as you've written it, as principles cannot be at odds with each other.
the latter yielding " 'exceptional' property rights " of slave owners?
By accepting the peculiar institution as 'legal' under the Constitution, - the framers acknowledged that some humans did not have life & liberty, -- that they were property.. This was an exception to the rule.. Get it yet?
[not that you haven't all along, and are just belaboring the point]