Andria,
I have never used WTAs but I have used NETs and the NETs dirty coils and wicks pretty fast. I am very confident that WTAs have even more particulates in the juice than NETs do ergo the wicks get dirty faster.
If you browse the WTA threads I am sure those folks will tell you they don't get near the mileage out of their cotton, silica or rayon for that matter.
By the way to make WTA they take the field tobacco hang in in the drying sheds just like they do with cigarette tobacco. Then they put the leaves in a "Ball Mill" and grind it into baby powder consistency prior to extracting and filtering all the chemicals they want to use.
With NETs they soak the leaves in PG for some time period until they think they have gotten all the flavor they can. Short of like making tea. My opinion (no guarantee) is that NETs while a little more particulates than flavored e-juice WTAs have a lot more. And the fact that it rinses clean or near clean kind of indicates to me the wick is just working like a filter collecting all the larger sized particulates.
I know no real help but check with the WTA folks and I think they will tell you that what you are experiencing is fairly normal.
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I haven't used WTA either but you pretty much summed up my thoughts in your post.
Are you squonking? I don't think rayon biodegrades that quickly, so I doubt it's the rayon. Could your tank have needed rinsing before you built? Maybe it's gunk residue.