More tricky than users would like - it seems to me (same as with the e2s) they test those with plain water, or very watered down liquid. And the taste of a T that doesn't wick any more is unbeatable. Unbeatably bad.
You can get most of them to work, by thinning down your own liquid or using very thin one, but it's not an ideal solution. On the one hand. On the other hand, they are still very easy to use, not messy, no cotton, and the taste is good. And I am one of those that hope the wicking problem will get better with new batches.
I vote for your idea. i am sure that joye tech is aware of the wicking problem and is working on it.