Eddie,
Here is what you can do to solve this issue.
#1. Put a piece of tape or business card between the two mold halves. When you gap the mold, you will open enough space for the mold to fill the keeper. If that doesn't work. Do the next two things.
#2. Cut an air relief line with a utility knife on both mold halves, where the keeper is cut from inside the keeper to the outside of the mold. The reason you are not getting the keeper to pour, is because the hook might be a little bigger in diameter, and it is trapping air in the mold, keeping the lead from filling there. Also do #3 while you're at it.
#3. Take a small round hobby file, and file out both mold halves, where the hook shank fits in the mold. By filing this out, you will also let the air release from the mold. Do not over file and make it too big. Make it so the hook shank is a little loose. One thing to note, is that once you file this area out, if you decide to put a smaller hook in there, you will get some lead flash seep out. No need to worry, you can always cut that off. If you want to call me with more questions, I will PM you my phone number and help you out.