Well I was on the phone with a LaBella big shot once concerning some sets I received that were faulty and felt different, string to string. I asked him if I could use them string through and he said yes. This was over 5 years ago, so things may have changed.
Whatever the big shot from La Bella said won't matter to me any more as I have no plan to go back to using La Bella flats.
Thanks to you and @Linnin and your feedback, I think I'm going to deal with my OCD by tackling it head-on, meaning I'll just put up with the visual imperfection of having the excess length on the E string wrap around the post. I'm confident I'll be able to get over it soon enough.

