I think this is great how it is! The original print worked, just cocked the screw as you made it tight enough so the phone did not slide out.
I had never used that horizontal compensation and printed about 6 screw working my way up to perfect.. it was a good learning experience.
I have only been at this since Feb and have been using Onshape exclusively as my first CAD software as it is free and fairly easy to get basic things done. I have not been spending much time trying to learn more advance thing as it has been sufficient for my little cable hold downs and webcam mount etc.. But now I want to know how to make threads! Just need to find time!
Posted my setup the other night while the first print of the screw was in progress https://discourse.octoprint.org/t/m2-pi-with-head/1952