I agree that some plugs, that are identical, don't fish identically out of the box.
And I can't explain why either.
I'll open a box of Tomics, (6 per) and maybe one out of those six will obviously out fish the others.
To me, all six will apear to have identical actions, and have identical finishes. But for some reason, you find one that, for who knows for what reason, is much more producive than the others.
I'd sure like to know why a few of my plugs have this destinction over the others, but I can't even give a good guess as to why.