What would be useful to understand if bridle lines are stretching is to have a factory published length for each bridle line for each model, year and size of kite. I didn't measure my Switchblade 2011 bridles when new...so maybe they have stretched a little?
Problem is, I have no reference to measure against.
(note to self - measure all bridle lines to the mm next time I buy new kite)
Yes, I agree that would be very useful.
I just asked the owner of Epic Kites about the lengths of the bridles of the Epic Screamers since I noticed some changes there too. I've got the lengths from him within 2 hours.