I went from silica to ekowool then to cotton in a very short time. I used the cotton builds for a while before I got hold of some Hemp Fiber and the hemp outperforms, outlasts and is more durable than the cotton. I've been using hemp for the last 10 months on my protank builds and been a happy vaper.
Cellucotton then came into the picture so with all the raves and hype I bought myself a 500' box out of Sallys, rewicked my protank sat down and did some vaping. The cellucotton did have no breakin taste which is nice, vaped a tank and it still was a nice vape. I filled the tank again, got through bout half and then I was loosing vapor production and having to pull harder to get a good vape. Removed the cellucotton from the coil, not burnt and still in good shape replaced it with another piece and began vaping again, same scenario of it beginning to get hard to pull and loss of vapor. Tried it in a different head with different resistance, same thing.
I guinea pig'd my wife with a cellucotton head in her protank without telling her, she came downstairs later in the day and told me its hard to draw.
I'm not sure why the cellucotton performed badly just for me or in a protank build since everybody else is raving on how great it is. I reverted back to the hemp fiber and now have 499 feet of cellucotton I'll never use.
I rebuild standard protank heads with 6 wrap 30 gauge spaced coils so nothing fancy.