I haven't had any issues with serving seperation on my '07 Allegiance after a ton of shooting. I was told by the shop that if i would switch at all go with WC. However, he told me that the factory Bowtech strings are considered pretty good and the only reason to switch would be for a color variation.
I was told the same thing....after I almost took the factory strings/cables off when I bought my bow to have WC put on it.
Let me ask you this.......if your fan belt on your truck kept having issues.....would you question the faulty belts from two reputeable mfr's.....or would you check your fly wheel (and if there are any mechanics in the house....I'm not sure that's correct...but I think you get the jist)? I'm not accusing you of anything Wash. you seem to know your bow stuff.....but you also seem to tinker with it a LOT.
Does your bow shop sell Bowtech? I'm trying to figure out why you'd switch to a string they sell (when nothing was wrong with the one you had).....but might not even be shooting a BOW they carry. (???)
Too mnay questions for me to even make a guess what's going on....but I'd say it isn't common among '07 Ally owners.
Good luck with your dilemma.