Solutions
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TurboTomato's post in v3.0 with Windows 10 and Nvidia DSR was marked as the answerRight - I have sorted it using this method. The crucial point that I missed out first time round, and that should be highlighted is that you need to be running P3D with a flight loaded at the time. I was doing it prior to launching P3D, hence why it was always at 100%. Doing it whilst P3D was running instead meant that when I went to the text size setting, it was already set to 200%, and reducing it to 100% gave me the x4.0 DSR I was expecting.
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TurboTomato's post in Questions about REX - Real Environment Xtreme was marked as the answerAs TheNerd says:
REX Essential Plus = Weather engine and texture program. Overdrive version (referred to as OD) just gives an even bigger choice of textures.
REX4 Texture Direct = Texture program. Also known as REX4 (without TD after it as at the moment there's only been one REX4 product released).
REX Soft Clouds = Texture program, but just for clouds. Integrates into REX4TD user interface, if you have it.
So really, your choice is REXE+ or REX4TD. Personally, if cost isn't an issue, I'd go with REXE+.