2X
Pour four times without a hook first. (some lead might come out the bottom - so pour on a metal surface)
The #1 thing for me is heating the hook when it is in the mold with a Trigger Start Propane Torch (open mold)
1 second blast works every time, if I have a good flow of hot lead.
Blast 3 pours in a row, then try one without a blast.