Refusing to give up, I tried two more tests on Canson XL watercolour paper. I washed the glass I have been using in case contaminants were my problem and I used more fresh water to wet the back surface of the paper. The first painting I transferred from the glass as soon as it began sticking, but this time I noticed that the layers of the paper were actually starting to separate.
For the second one I prepared the paper in the same way but I taped it to a board instead of glass. It worked absolutely fine with no sticking.
Just in case I had not left the paper on long enough, I took a very small scrap of XL, wet both sides, taped it to the glass and left it over night. The paper stuck and separated.
Conclusion: Paper production often changes over time. My XL paper is a few years old, so other artists may not experience the same thing I did. But I will not be using XL paper for painting with lots of water again.
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