Since the hyperfocal is bigger than the actual distance you want to use it for, then I would say that your images may be blurry.
Here is a sample picture in the green channel with the camera set à 1.2m. The result is actually pretty good. Note that this is not a full validation of what would happen in the field, it merely a check that nothing too serious is happening. IMG_700101_000044_0001_GRE.zip (1.2 MB)
If you want to adjust the focus, then you need to remove the glue that is securing the focus. You just have to adjust the focus by rotating the lens in its holder.
Note that the warranty will be void if you do so
We can discuss your application in private message if you want.