Thanks Andrew.
Yes, I have used other papers. I was originally using Platine but it was not clearing. I've also recently tried Buxton and Herschel which seemed to be clearing fairly well but not upon close inspection. Also, the texture of the papers wasn't working with my current project. I do quite like the Cott paper, as it's a brighter white with a smooth texture.
Though it's close, the Cott is not completely clearing; the whites are buff. This shows when the test print is scanned.
It's close thought, really close. So I'll keep working on it.
I'm concerned about the acidity of my FO solution though? Is that normal?