Dynex Dux being a plastic it will creep some under any load but it can be controlled if properly sized. My 8 month testing of some 9mm seems to indicate that creep is insignificant below about 7-8% of MBL and starts to get out of hand around 14-15%. One odd result that I don't fully understand is that repeatedly cycling from 6% to 15% of MBL didn't increase the creep rate much over the static 6%. The test was 300 cycle of 45 minutes at 1500 pounds and 15 minutes at 4000 pounds. Theoretically the creep should have been a lot more than was measured.
If you can keep the pretension under 10% a turnbuckle should give enough adjustment for several years.
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