If you look at samson's double braid splice instructions for used line it accounts for the problem you are having. I don't have it on me but it basically adjusts your measurements to account for increased friction of a used jacket, it will not slide back down nicely like new line as you can see. Not a big deal at all I'm sure someone will come around to give you more specifics on how to adjust your measurement, I'll see if I can dig up the samson book.
FYI it doesn't matter how little a line was used, unless it was stored inside the UV alone will stiffen it up sufficiantly to give you a headache
Jake
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