So you would prefer a non-braided vectran line, with cover, if you were to try this again. Correct?

Most of the problems I have heard about (from larger boats), is the initial creep. They are continously tighting stays etc. the first times they go out with new rigging.

I dont know how you do this, be we always tighten our rigging before we go out. We do it by moving the main-traveller out to an end of the beam, and sheet in so the sidestay goes slack. It's easy to tighten the rig then.. (Takes two persons on the trapeze at the transom to release the rig again afterwards, if we forget and takes the main down).
Is this about the same tension you applied before you went out?

It would be handy to know what dimensions you used, as windage have to be balanced against weight.