Wouter,
About what lengths work best for your multi-level Swiftcord 5 and Dyneema 3 mm mainsheet? Like---Insert only 2 of the 4 meters of 3mm and sew it up?

I did this with some 5/16 inch (8 mm, sorry) Maffioli + inserted 3 mm line but the small line is wearing on the blocks (8:1) faster than it should.
Help::: What is the double-woven-cover green line (3 & 4 mm) that comes on the Bimare boats? It is wonderful stuff not available in the USA, wears like iron and lasts forever.