I had the oppisite ...factory strings on many brands were nortorious for serving seperation...causing many issues...we tried most well known brands out there ...we had the same issue with WC ...however Worlds Best Strings have solved that issue completely...We use a lot...a lot of WBS every yera and have no issues at all...one of the best strings for having bow in spec tune on install...and never serving issues ...
In fact I install WBS on all my personal bows right out of the box..
Also WBS is Canadian...and has an awesome warrenty...if you have an issue Allan will solve the issue...and Quickly...
WC are made in the USA and will take longer to work out issues...
I personal think WBS are truely worlds best!!!
Have a look see...
http://worldsbeststrings.com/
JMHO
Neil