What length to make new shrouds?

[Essington]

I am replacing the standing rigging on my Columbia 24.
The other times I've replaced rigging I just sent the rig plan to the rigging shop, and a couple weeks later I received the new gang in the mail.
Well this time I'm replacing the stainless rig with Dyneema (STS-HSR). I'm curious how long to create the stays? My turnbuckles have about 4" of throw (full extension to fully closed).
I'm pre-tensioning the splices so I don't expect much in the way of constructional stretch.

Do I splice the stays to match the turnbuckles at 3/4 extension? Full extension? Is there some standard used for stainless stays?