Imo the "not being able to read moonrune" excuse is moot seeing as how the game only has a certain amount of prefixed questions with prefixed answers that affects your unit in the same way everytime a certain answer's picked.
The same questions always produce the same +++ and --- answer or the same -++ and +-- answer.
After 15-25 weeks of game time one should be farmiliar with the questions and their associated answers.
Anyways, for me a correct morning commu involves the least amount of angry faces you'll see when you pick an answer; 2 happy 1 mad or 3 happy.
I've been referring to such answers as -++ and +++ answers for some time now.
Ideally the quickest way to get out of strained is by selecting a +++ answer in the morning and selecting the correct answer during evening commu, most people might not like having to look up everything on the internet all the time when playing a game so there's the morning commu method.
For ease of explanation I've made these illustrations in ms paint for the morning only method. Note. images are for illustrative purposes and aren't accurate, though they should still give some insight on how juggling mood works for iM@S2. Also, the game doesn't give you a clear indication on the individual tension between your idols but that doesn't really matter neways.
Assuming you'd just lost to RK, member 1 and 2 will be angry at Leader.

The fastest way to get back to neutral would be to balance the tension between the 3 idols; we want to make L happy while retaining or lowering 1 and 2 evenly.
Assuming yo get unlucky and get +-- and -++ answers, obviously pick ++-, if you can pick +++ go for that one.
Here I'm picking an answer that negatively impacts 1 while raising L and 2 (-++)

See how the distance between 1 and L decreased?
Now do the same but for member 2

The tension between the 3's somewhat balanced by now and the overall status should be back to neutral now.
Though 2 weeks should be enough, repeat when necessary if it's not back to neutral yet.
While we're still talking bout plus and minusses, because unity's the game's main theme one can't randomly raise tension.
Assume one's been focusing plusses on one idol
Nothing wrong yet but..

With the surplus of plusses the other 2 will think the happy idol's annoying and/or can't cope with their stupidity/sillyness which'll turn the overall mood to Turnoff [Sweatdrop]

Onoz [lightning bolts], if you don't fix this soon we'll have a falling out soon..

This also applies to getting surplusses for 2 idols and leaving one out, we'll get the [broken heart] instead of a sweatdrop then.
Also, I know I picked horibad colors but I'm too lazy to redo those images. Just squint a bit if you're having a hard time differentiating pastel yellow from white.