making a screecher and it has a luff pocket meant for wire but of course I am going to use line... and I have a question
which one of these has the least amount of creep?

amsteel blue (dyneema sk-75, not "standard" spectra)
vectran
AS-78
technora (tech 12, ultratech, T-900)

No one seems to quantify creep (they quantify stretch but it is not the same)
the amsteel is probably out due to high creep but thought I would throw it in there for discussion.

Secondly- if you pull the creep out- relatively easy to do- especially if it is tensioned like a halyard, does the line recoil when the tension is removed? I guess that would be stretch though... so then, theoretically if you get the creep out then it is out for good?