It is indeed the mold you gave me! And I was definitely taking my time pouring, so I didn't get it fully heated up. Yesterday was just to make sure everything worked and figure out the process. I'm planning to really get casting this weekend if the weather can stay nice!Those wrinkles show the mold is too cold. The first few pours are throwaway, just to heat the mold.
If that is the mold I think it is, it wants to run hot.
Good on you! This rabbit hole runs deep.