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Hi again,
Actually, STS is much stronger than the Samson (12,000lbs vs 8,600), but the most significant difference for this application is constructional stretch, which isn't stretch at all, but rather the effect of strands settling into place under load. For the Samson, you can likely count on about a foot for every 50ft. of run; for the STS, a third or less of that.
Note also that your splices will cause the rope to shorten by an inch or more, again depending on the material, as well as the length and degree of taper in your splices. A little experimentation will reveal how much shrinkage you get from your splices.
Ain't learning grand?
Fair leads,
Brion Toss
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