Splice question

[SV Papillon]

Hello,

I used synthetic 11mm 12 strand line for my lower shrouds. They are brummel splices around the mast. I was unable to pre-load the splices. Is there a approximate set amount for a given line diameter for a brummel splice? I will most likely use a brummel for the lower splice as well and plan to make the eyes short with a shackel to the turnbuckle to allow for growth as the splices set.

Thanks

Jake