Hey,
I'm not sure how much this has been paid attention to, but I just thought I'd come here to say that since the recent building changes (more buildings per holding and buildings which just grant dev), dev in converted games seems a bit high to me. With vanilla weights, I ended up with all of the CK3 map being converted at over 20 dev, with some places hitting 40 converted dev. Any war gave so few provinces because it made province cost and AE super high (France had something like 1300% war score cost at game start)
I toyed around a bit and thought that the settings below worked well, but I'm certainly not claiming that they are optimal, just a starting point.
dev_from_building = 0.1
dev_from_holding = 1
dev_from_development = 0.15
dev_treshold = 70.0