Quicklook slideshow image scaling

[mattspace]

So in the switch from Sierra, the old trick of:

1. select (a bunch of) images in finder
2. hit space to open
3. enlage the window by any amount
4. go fullscreen

would result in a slideshow with every image zoomed to fullscreen, or in Quicklook staying full screen, and being able to select images in finder on a different monitor, and have them stay open in full screen, regardless of the image's size.

I can't find a way in Mojave to reproduce this behaviour in Quicklook.

Has anyone found a workaround, or a defaultsWrite solution to set quicklook to always open images at full screen size? I really don't want to have to go to a dedicated application - the workflow really depends on just being able to click between images in finder, and see them full-screen on a different monitor.