I don't think a nylon blade is more evenly lit, it's just that the nylon blade itself glows, so it looks more like a solid energy beam, than a beam of light inside a clear tube.
And I have used both the cellophane gift wrapping and also the Ultrafilm in my "Dual-Core Diffusion" blades (I like to call them that, just sounds cool!), and haven't noticed that one is better than the other. Where I've seen a slight difference, though, is in using a 10deg lens as opposed to a 5deg in the thin-walled blades...I think the 10deg just disperses the light through the polyP/Cello better than the 5deg. I've even gotten decent results with 15deg lenses as well.
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