I'm done with this now. After repeated reports that tech costs were still too high from the Industrial era on, I also reduced the costs somewhat aggressively, so I need additional feedback on whether I went too far. The current tech curve is now designed in such a way that all techs of every era roughly cost 150% of the previous era.2. Finishing technology cost balancing. One technology costs are final, I will remove the era based modifiers and apply their effect directly to all techs of that era, while smoothing the tech cost curve.