I think you were using standard spider wire, which is pretty thick stuff. Stealth 8 is thin.I must confess I have also tried spiderwire stealth a long time back and found it too thick for it's breaking strain for my liking. I think it was 14lb and it was more like 30lb.
I've been using spider wire stealth 8 smooth for a long time now, but I can't help but think that all these £20 quality braids are coming from the same factory and having a few cosmetic tweaks.
If you want to go down a different road..which I haven't been maybe try tasline or varivas. Sunline used to be a popular brand too.