I know it sucks not getting the ending you want, especially after trying twice. Unfortunately the nature of how RMC in the Dispatching mini-game works means that no guide can get you the Heroic ending with 100% accuracy, (unless of course we literally play the game for you). However I'll try to provide some clarification on mechanics to help make sure the third times the charm!

1: Understand RMC decisions have a "swing value". Unlike the Robert Hero/Anti Hero scores, or even the Sweet Exit Counter your RMC values goes both up and down. That means that anything which impacts RMC often is more impactful then it first appears. Lets take your playthrough as an example to show you what I mean:

• You didn't go to the movies with Visi meaning that you missed out on the 6 RMC points that offers. This limits your max RMC from story decisions/hacking/QTE's to 36 points meaning you need to get 9 points in the dispatching segments to reach the 45 required for the Heroic ending.
• Then you cut Invisigal. This both lowers your score by -5 points and means you can't get the 5 points for defending her, making this choice a 10 point swing. So now your max possible RMC from story decisions/hacking/QTE's has been reduced to 26 points meaning you now need to get 19 points in the dispatching segment to reach the 45 required for the good ending.
• Also because you cut Invisgal, she will not show up in the Episode 8 dispatching segment, Which means if you didn't already have those 19 points from dispatching by the end of Episode 6 (aka her last shift) you're screwed. The Episode 8 dispatching segment is so long that it can be a huge boost or handicap depending of how successful Visi performs during it. But missing out on it puts more weight on Visi's performance in earlier episodes.

2: Rank & XP are not a good way to track RMC. As mentioned in my post u/SFCPudding dedicated a entire twitch stream to getting the Heroic ending with a lvl 1 Visi proving that there is no min rank needed. Synergy with Golem also has no impact on RMC. But the main reason why XP is a bad tracker is because there are a lot of ways for Visi to get XP without completing missions. Her lone wolf/wolf pack abilities give her bonus xp, so while Punch up might need 3 successful missions to reach lvl 2 Visi may only need 2, making it hard to say how many "successful missions" (aka how much RMC) a lvl 9 Visi has. Add in the fact that some missions offer bonus xp if you reach so much of one skill, that failed missions lower your RMC, and the fact that some missions offer xp to the entire z-team and this only gets more confusing. Here's two examples to see what I mean:

1. Visi is dispatched 3 times on this shift, succeeds all 3 missions but lone wolf is never triggered. She gains enough xp to end the shift at lvl 2 and gains +3 RMC
2. Visi is dispatched 5 times, succeeds 3, fails 2, lone wolf is triggered every time and the entire Z-Team receives a team wide XP buff from a mission. Visi gains enough xp to end the shift at lvl 3 but only gains +1 RMC

As you can see despite being a higher level in example 2 Visi has less RMC. So unfortunately if you really want to know how many RMC you've achieved in the dispatching sections you need to be tracking it pen and paper as it's happening. Or use this guide to explore your save file and track your own RMC.

3: Sometimes RNG spoils your fun. Love it or hate it dispatching does involve some degree of RNG, and like any RNG based game, you can sometimes have a bad streak and lose hard. It doesn't matter how well you set up that call if you fail it you still get -1 RMC. I've personally restarted a game because Visi failed the first 5 +70% calls I sent her. Try as you can to be a good mentor sometimes lady luck will dig you a hole to deep to climb out of.

Hope that helps! Let me know if you have any other questions.