Ok so you picture the sliding scale between reggae and techno, under the umbrella of what you describe as the dub sound. You can find examples of dub-techno that can be anywhere on the scale left or right between the two genres.
dub reggae|-----------|techno
There is heaps of examples out there, but the one I was just listening to was this mix.
Have a seek around and you'll find some tracks that have a reggae vibe to it and even reggae lyrics. The whole mix is tops but there are total changes in the mood from deep heavy house techno, to chill dub reggae.
So this scale and conjunction of two unlikely genres is what I'm interested in finding out how it was originally formed.
Cool, really nice kick/bass interplay, you should send your stuff to Dub Techno Blog, maybe it will get played on the live show.
Her production falls more into the deep techno/voodoo techno category, but Cio D'Ors DJ sets incorporate a lot of really mesmerisingly good dub techno. [https://www.mixcloud.com/wolfenstyle/cio-d-or-on-clouds-11/](this) set in particular is one of my all time favourites
EDIT: I have no idea why the link keeps derping
The Echo device that comes with ableton is actually really good, however, I would try out some free reverb plugins, because imo the ableton reverb is stinky garbage. Download a bunch of freebies and see which one you like. If you are unhappy with the instruments that come with ableton, get Surge. It's really good.
There's a lot to do with dub techno as a genre, I think people have taken it to a lot of different places in the past few years. I think it's easy to assume that the only elements to dub techno are tape noise, echo, and chord stabs, but there is so much more you can do. It doesn't need to sound like it came out of germany in 1993... unless you want it to, of course.