Yes your jig is 2 hot when your dipping them. I bet if you look close. Theres some smoke coming off the jig when dipped in the powder?
I run mine back through the heat gun to set the powder. And doing that, Stops any running. But I am not sure a cone head is a bad thing. Just not good if your going to sell them. But for use, I had one last year that caught fish good. Until I lost it .
Pete