I have this exact same problem, the only difference is that I'm only using the TSLRCM 1.8.2 and the M4-78EP (They don't label versions for some reason). I cannot advance the plot, I have completed all other content that I'm aware of. M4-78 does not appear on my galaxy map, not sure if it is supposed to yet, it is irrelevant currently.
If it's not a mod issue, 1.what is causing Kelborn/Kavar/T3 to not allow this essential cutscene to happen aboard the Ebon Hawk when the prerequisites have clearly been met, 2. How can I get past this issue without starting a new game or re-installing, if possible, 3. If there is nothing I can do directly via file editing or console commands, does this problem manifest at character creation or along the way?
If either Hassat Hunter, zbyl2 or another author of this project could reply that would be great, I've been trying to troubleshoot this all week in time for my livecast starting soon. Thank you so much again for making my favorite game ever even better.