To answer a few questions
Lead is defiantly soft. I purchased the material at a local scrap yard, it was 1/8" lead shielding from an x ray room. I cut it with a pair of scissors.
The amount of lead in the pot could be the problem, I only have about half of the pot full. I will try to add more material.
I heat the material to the level 7 setting.
I will defiantly try your suggestions.