the major thing that makes a difference is the discrepancy in diplomacy.
So you say, but that's not what I'm seeing. Just checked running the new CU. Tried a trade with Friendly Korx. Offered double RPs plus 4000 bc and was refused.
Offered Eco plus Research Treaty for Eco (my eco and res are both bigger than his). Refused.
His Diplomacy is 74, mine 64.
Researched Xeno Intimidation. Diplomacy now 89; Korx 74; Altarian 80.
Ran a turn to let things settle.
Korx refuse triple RPs plus 5900 bc for Research Centers.
Altarian accepted quadruple RPs for Expert Logistics.