Ok i've been playing the Yor, and now i'm playing the Arcean campaign. I captured a Drengin planet that had 25% research, 25% manufacturing, and 25% population growth. How this would help population growth beats me, but that's not the issue. Two almost identical one per planet except why is the Yor so much weaker. 10% instead of 25%. I'm not even wining that the Drengin version is, so much more useful by being a research improvement. Why is it not a manufacturing improvement doesn't make sense, but I can't argue that the power matrix is a population improvement. But 15% less why. I just want to point out I'm not whining about +1 to morale. This is way more worth a .3 extra maintenance.