It achieved its purpose
Proved that the double stripe technique worked
My idea of only applying the stripes to two thirds of the sock didn't look as good as I hoped
I had a much better idea of how long I needed to cut the strands
I knew that I don't really like the variegated yarn for the stripes
I knew to use the same weight yarn for the colourwork
I solved the mystery of the difference in strand lengths - I am pulling the yarn tight on the first stripe of the needle
And I still have a perfectly wearable new pair of socks :)
So on to the next version - double stripes all round. And another lesson learned - the double stripes are at a tighter tension than the rest of the sock and while this did not make much difference when I was not striping all the way round it made a significant difference now. Half an inch and slightly less stretchy made for a tight sock for me but perfect for 'Small'.
So that was 'frogged' and on to working on a pair of 'Medium' sized for me. Maths done, pattern updated and cast on again. And my calculation for strand lengths is pretty accurate but I have added a little contingency in to the pattern (better slightly too long than too short).
Really pleased with how they turned out. And unlike my other 'stripe' sock patterns these can also be made cuff down. I wouldn't recommend two-at-a-time but I already have a tester lined up who wants to try :)