I see you bought these from Design by Sick. I bought a similar set about 3 years ago. I was excited too at first but have since found this thread breaks much easier than the better brands (like Sulky, etc.).
I'm sorry to have to share this but I'm just not happy with this thread and use it now mostly for tests to use it up.
On a separate note, if the design isn't too dense, it works better. Or, if I slow down my stitching speed.
Before anyone else says it -- yes, I made sure I was using the correct needle LOL
BUT....maybe you'll have better luck than I did. I guess bottomline....No, I would not buy from them again.
ThreadArt has fairly good quality. I have tried theirs and it's better.