Most tuners go back then forwards not all the way in one direction
I also only go right then back left
I was told that is the proper way
What I’m trying to figure out is how mom ducks or chickens know what way they are turning what egg 😆
My guess is the rollers are not properly turning the eggs. This will lead to death on the embryo
Try setting eggs and hand turning them the next batch and see if that makes a difference
Also move the eggs around instead of staying in the same spot
I do this with mine even if we use the turner...