Ok so I took a look at some old code I made, and the only two difference I could notice was that first, I used model:PivotTo() for models, and that secondly, I used a RenderStepped:Connect() instead of a while true do.
I also didn’t re-get the part im moving, the character, and the HRP, and instead just kept their references.
How to make part "collide" when dragged by mouse (post containing my code, if you want to see)