Javelin,
I too had problems with that mold.I tried everything you can think of to fixit. I then wrote to Do-It with my delema. They advised me to use soft lead. I got a small pot and use nothing but pure, soft lead and hav not had a bad pour yet. I re-ordered the molds, both the jig and spinnerbait and use them unmodified all the time. Hope this helps, and as a side benefit, the baits come out brighter and shinier.