I see this issue come up often.
I have this mold and the first time pouring the 1/16 oz. I saw that there are issues with the hook being loose on some of the jig heads that I was pouring.
It appears that on the 2 smallest sizes, there is not enough lead surrounding the hook shank just past the bend of the hook
So, the hook will sometimes rotate in the head due to the lack of support
What I did was create a short collar at the base of the head to help keep the hook from rocking back and forth.
I used a ball endmill, and made this mod in a mill, but this should be able to be accomplished with a dremel and the proper bit.
With this mod. there is adequate material to support the hook where it exists the back of the head to keep it from rocking side to side
The ball diameter is 1/8" and it sticks up 1/16"
The z-man material is so soft that pushing the bait tight against the head is not a problem
I hope this helps some of you.