From the FAQs on the Cordoba site:
"The bridges of our guitars are built to withstand normal or hard tension strings. We do not recommend using extra hard tension."
Whether that's because of potential harm, I do not know, but I'd be hesitant to try. It's also interesting that I've seen several sources that claim higher-tension strings, on some guitars, can actually inhibit movement of the top, leading to diminished volume and responsiveness. I guess the tautness of the strings prevents the top from vibrating as much as it might otherwise. So you may not be missing out on much if you were to try X-hard tension.
-Bob
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