I really like the umbrella material of the Final E too. There really isn't really anything quite as sticky and smooth on the market. There are the likes of SpinFit W1; they are only sticky, not smooth. Doesn't work for me. Most others are more smooth and less sticky, and don't grip quite like the Final E.
If I have to recommend something that gives me the same sense of wearing security as the Final E, I'd say the Tanchjim T-APB. It is about as sticky and smooth as the Final E clear, not as sticky as the Final E black. More importantly, the T300B is shaped almost exactly like the Final E. The T300T is like a Final E TWS with longer stem.
If you are specific about the shape of the stem of the Final E TWS, which is a wider opening than the bottom of the bore, look at Sedna Vivid and JVC Spiral Dot.