Hm, would it be possible to send me a screenshot of the inspector for the quad? I'm wondering if it's possible "override filter mode" is checked and forcing it to render in a mode besides point. You can also define a size there, which will be relative to the size of your text, so tweaking the value there might help? As long as it matches the text, integer locking shouldn't be needed... Do you have "Pixel Snap" enabled on your font's shader?
Those are my initial thoughts! Please let me know if those did anything, and I'll take a deeper dive into this if that doesn't solve the issue.