It sounds like you've been through quite a journey with different thread brands, and I'm sorry to hear about the frustration you're experiencing. Dealing with thread that frays can definitely be a headache, especially when you rely on it for your products.
While I don't have personal experience with the specific thread you mentioned, it seems like you've already tried a few different brands without success. Since your contract sewers are experiencing the same issues, it does suggest that it might not just be a one-off problem.
It might be worth reaching out to other makers or sewing communities online to see if they've encountered similar issues with the brands you've tried or if they have recommendations for alternative brands that have worked well for them. Sometimes, hearing from others who have faced similar challenges can provide valuable insights or suggestions.
Additionally, you could consider contacting manufacturers directly to inquire about any changes in their production processes or if they have any recommendations for addressing the fraying issue.
I hope you're able to find a solution soon and get back to focusing on your products without the added headache of dealing with thread problems. HAPPY SEWING
Hey there, fellow sewing enthusiasts! I'm Emily, and I'm absolutely in love with all things stitching-related.