So... I have to give the greatest shoutout to this forum and this thread and SUP and Nigel for a problem I have had for 10 years : nice diagonal stitches on round hole punched items.
Basically -- I am left handed, and come in on initial cast from the left, and always have gone under. All stitching looked like the first few holes Nigel stitched. I decided there was no way to do diagonal stitches with round holes.
I watched this video and I saw it COULD be done -- so assuming I was doing something wrong that I had been doing since the beginning, and knowing my left handedness might have something to do with it... I modified my cast to pass the first needle OVER the second needle, then back through for standard knot.
Voila - perfect diagonal stitches with round hole punches. (Still need to dial in spacing and tension, but primary mechanics are in place!)
Clouds parted, sun shining and a 10 year problem solved.