G'day Rob,
It's funny you say you're not a fan of the 100degree eyepieces. When I bought my Ethos I didn't like it and considered selling it. But everyone said hang in there and see if I get used to it. Well it took me a few sessions, but now my Ethos is my favourite eyepiece and I went and bought another one. So, firstly I would say from my own experience, don't judge the 100degree eyepieces too quickly or you may end up missing out on some of the best views out there.
Al Naglers famous advice is to use the highest power eyepiece that completely frames the object you are observing. This is where the 100 degree eyepieces work really well, because you can use higher power to see more detail, yet still fit the object in the field of view.
I think the Delos are great at high magnification on smaller targets like planets, globs, galaxies, planetary neb, etc because the 72degree FOV frames the objects well. But when you are using mid to low power to view larger objects, I don't think the Delos frames the object in the same way that a wide field eyepiece does.
You definitely should pick up a Delos because they are amazing eyepieces. My only suggestion is you think carefully about which focal length to get.
The 12mm to 14mm focal length you are looking at will be one of the most used eyepieces on a range of objects, and I reckon a wider field of view at that focal length is important. They say you should spend the most money on an eyepiece that's around twice your focal ratio. So go on, give a 13 Ethos a go, they are only going to get more expensive.
Anyway, good luck. See you soon