I used the T3S for a long time. It was my go-to tank for Spinner type batteries and also my doomed Evics (the orginal).
I guess I spent most of 2014 rebuilding the atomizers with wire and wick, as I got bad tastes and leaking after 4 or 5 days more often than not.
About a month ago, I ordered some new Kanger atomizer heads (from Fasttech, China). They are the same old design only with cotton wool instead of silica. The ones for the T3S are called TOCC. (I also bought SOCC and VOCC.)
So far, they have been really good. I'm afraid my experiment was kind of stalled by attending the UK Vapefest, where I was mainly using drippers and sub-ohm tanks...
I would recommend you try the TOCC... just watch for the price on them. They'll be variable as they are newer. I paid $4.50 for a 5 pack... so they'd be about $9.00 from a US store (I guess)