Probably a bit late for you, but I’m sure there are other people (like me yesterday) wondering about this. I got it to scale to what looks like 125% by first typing into the terminal:
xrandr --output [Your output device here] --scale 1.75x1.75
Which makes everything super tiny. Then going to the display settings and changing the scale to 200%. Seems perfect as far as I can tell. No blurry fonts issue like with the Wayland solution.