Case in point, in Drox you are somewhat unlikely to get Shadows into a Diplomatic Win situation because they tend to backstab friends by sabotage. In my relatively shallow experience, their current relationship value with a third player means relatively little except as a priority queue as to who to screw with next. After exploiting the hammer, so to speak, you can find them secretly bombing their most hopeful alliance partners. Drox is far more pre-World War I in that intial insults tend to spiral out of control and everyone polarises.
On a deeper level, this is about immersion. Since they are pretending to be sentient lifeforms, at release I would like the majority of AI factions to pretend that they are able to plan, or have emotions. For human societies at least, democratic leaders have to answer to their feel-good public, which also applies to weaker oligarchies/dictatorships. So I would like, in the end, to be able to get more empathy out of Peltians, Skylaxians, and Andors - who strike me as familiar communist/republic/democratic-like factions. Boarines descriptions also read as if one could suss out their intentions. Evuck and Acutians, if anything, would fall under the description "there are no friends in politics".
I highlighted intentions apart from immediate relations, because your goals are intrinsically political in TLF. However, I admit that politics ~= not meaning what you say, and AIs are generally coded to be perfect players with perfect information and don't care what you think. So I'm approaching this as one of the way in which AIs could feel more life-like. There are other ways to hang a sentient face on them, such as running incidents on twitter to describe otherwise inexplicable shifts in relations. U2 crashes, whales, emission treaties, EEZs around nameless islands... this you're probably planning to do.
In the end, I think a lot of us politically-aware people have sat around wondering Putin's next move. It's fine to not have a dialogue tree with him, although I think mature players get kicks from obtaining signs of foreboding doom from a political informant - I'd definitely spend BP to spy on the senate, - and (de)-escalating verbal barrages on twitter space.
(BTW, the feed should keep scrolling if you pause, because their events are usually lagging behind the actual simulation).
Re: Andors/Acutians. I don't have a recent save pre-incident on that -100 shift, but you sound like there are other ways to guarantee -100 relations other than launching a planetary body. *narrows eyes*
There's no chatter between them on twitter and nothing that I can particularly point to. The test808-4 save in the various bugs issue on Mantis is the same game, post incident.