I shot for Pearson last four years. They are using Brownell UltraCam the last two years. I don't know who is making their string, but I haven't had any problem with them They are always a hair tight when new but break in pretty well. Never had them so tight that I physically had to pull them off the string. I'm an old target buff and learned a long time ago that you should be able to hang the bow horizontal and tap the string a good one and the arrow falls off. And I don't think Carbon Express nocks are much different for fit than most others--at least not that tight. I'd just reserve it and be done with it.