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Maximum static backstay load should not exceed 25% of the breaking strength according to my owners manual. That would be 2000#, also per C&C, for 1/4" dia. 1x19 stainless wire. For my old boat, I would not approach that figure.
The same manual suggests tuning shrouds while underway (after setting the mast perpendicular to the athwartship waterline plane.) by observing the mast when heeled 15 to 20 degrees. The uppers and lowers should hold it straight, and the leeward shrouds should begin to appear slack. The same should be true on opposite tack. It seems like a sensible procedure.
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