Thanks tshering and davidfor, that doeslook like what is happening.
This means that there is a way to effectively reduce the Kobo's minimum line spacing from 1.3 to 1.0 while still leaving it adjustable: just scale up all the font sizes in the book so that the size of the main text is 1.3em (removing any existing line-height directives if necessary).
I have tried this with one book and it works well. From my Glo's font menu I just reduce the font size slider to bring the oversize fonts back to my normal preferred size, and I can now adjust the line spacing right down to the point where the lines start to overlap using the slider.
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