I think you have multiple things going on there....

My "go to" method is exactly as what Kodak says on its technical reference documentation for D-76. (because that's what I use) Inversions every 30 seconds. I think, though, the second image IS showing camera shake. Shake as a result of mirror slap, maybe?

I am not sure where you heard stand development is the "go to" method. If you want to debug your system, my suggestion would be to develop as the manufacturer specifies.