All great information.
Ha, agreed 
JWK does make some other dampened stuff but not much - I think the T1s are indeed the only tactile right now. There’s the silent linears, which I think are sold under the name “Dolphin” in addition to just “Durock Silent Linear” or something along those lines. Kono has a glow-in-the-dark one. Same dampeners that the T1 Shrimp has.
JWK also has the JWICK Semi-silent linear; it’s a long-pole with a dampened top-out. These use a different dampening design but aren’t anything out of the ordinary there - I mention these because I do expect to see them show up on some dampened tactiles eventually - these share tooling with the Taro tactiles. Here’s a photo from ThereminGoat’s review; the dampeners are the blue bits:
I’m a huge fan of TTC silents (typing on them now), but I actually had no idea about the different kinds of pole. This definitely makes me want to inspect and compare this aspect more closely - fascinating. 
Anywho; whichever version the ones I’m using happen to be, I love the fully-silent Bluish Whites even if they aren’t nearly as quiet as U4s - easily my favorite silent. The only thing I’d change is adding a 5-pin version.