As has been pointed out in previous posts I did a comparison between two identical controller2 bars and discovered the lines on the
2 season bar about to be about 450 mm shorter than the new bar. The lines are always washed and no sand or salt is apparent between the weave as has been suggested as a possible cause of shrinkage. Ruling this out I can only guess that UV and the harsh conditions lines are exposed to is the causal factor.

I suppose if all lines (front and back) were shrinking the same amount and stayed the same length or were calibrated to be the same length then there should be no real difference in the performance