Hi dale,
unfortunately I don't know how to help you.
My images are tested to be flashed as is. You are even using the miniloader from another project (which has a lot in common with this one anyway). I understand that you have difficulty in making it work, but unfortunately for me it becomes difficult to understand where the problem lies.
I can tell you that in today's build I removed a miniloader that was giving me problems. Try and tell me if it's better.