Help From The Community

I have a quick question about saddle sticthing. I have not been able to get the angled stitching on both sides of my practice work. I am using japanese pricking irons that are 3 mm, john james #4 needles and thred that is .45 mm. I am able to get the results of angled on one side but not the other with a cast. I have watched the video at least 4 times and i am missing something. i need some guidance from the group. thank you

chris kujawa