I'm struggling to follow, a little bit, which endings you've gotten and which you have not but I think you're striving for the "Dramatic Ending/Inevitable Path Endings" -
For Asher, Daaz, Raif, and Yren, you can essentially get on their romance path in Chapter 5 and then keep your score as low as possible and you should unlock these alternate endings.
With Kav and Noel, though, it's a bit different and I think Kav's dramatic ending is probably the trickiest to get.
I don't have an exact guide for unlocking the Dramatic endings but for Kav, I would probably recommend saving after you're safely on the route (just so you can go back to, say, the beginning of Chapter 6 vs replaying the whole route. And then nurse the points from that moment onward so that by the end you look like you have about 75% - 80% of the bar filled by Chapter 12...and you keep it there (I know it's tricky because there isn't percentage marker on the bar, and you only have about a 12 point window where if you're below the threshold you get the Vael ending and above it you get the companion ending.
Noel's works a little different than this. You should be able to get his dramatic ending by ensuring you choose:
"Yeah, but you know I can't do much to help you at this point, right?"
way back in Chapter 7, then keeping your score low. This should help you bypass his bad ending in chapter 12 but also not lock you into the Companion ending.