Should I use Dynex Dux?

[Gashmore]

Until about a week ago I was sold on going to Dynex Dux standing rigging for my 45' monohull but I have had three different riggers trying to talk me out of it. From what I have found so far I think if the pre-load is kept under about 7-8% and the line is sized so it never sees more than 20% I won't really have a problem with creep but these guys have looked at the Hanjidan site and say they don't like what they see.

I have to admit that the available technical information is a bit sparse. Even allowing creep not to be a big problem stretch under load makes a big difference. I asked someone at Hanjidan Canada about an elongation (Young's) modulus so I could get some idea of dynamic stretch and all they could say was it stretches about 3%. But 3% at what load? Surely not at 20%. 3% on a 60' cap shroud is almost 22". How do you compare an N/tex of 120GPa of Dynex Dux to an E of 107GPa for 1x19? If I knew the denier of each line size I think I could figure it out but nobody can tell me.

I guess I am just a congenital engineer. I like hard data more than sales talk.