These 2 subjects are not related, but tackle the ones you want
1. I start to have suspicion that the diplomacy team assigned to a race don't do much. It has been 15 years that I have a diplo team on the USA, and they have the lowest diplomacy rating toward me (1600 points) compared to the 6 others human NPRs I don't court actively. That would be quite a lot of bad (or good?) luck if somehow I managed naturally to achieve a greater score with 6 NPRs where I don't have a diplo team, compared to the single one NPR where I have a team... You follow me? It seems like my diplo team has 0 effect. And before you ask, yes, the team is assigned to USA in the intelligence window. It is not just on the right planet...
During all this time truce countdown was in effect, so there was no particular irritation factor...
2. Ruins. If I put several xeno teams at work, will they decipher the ruins faster?
3. Bonus Q
what is the use of the factory bonus for ship commanders, except hastening jumpgate construction? Does it do anything else?