Took a look thru your version and noticed a few errors. Will post details when I can but off the top of my head: tables don't override default DeI values (which explains the high conversion %), building progressions not scaled (Ex. Lvl 4 temple with lower % than Lvl 1). Also, in order for the conversion to be cumulative (to represent the "weight" per faction) the effect should be applied to all regions, not just local provinces. I'm testing a version with the new beta now with a few new values added. For example, iron and copper working increases Celtic influence across all factions slightly, Lvl 4 marble settlements increase Greeks, Lvl 4 Slave Industries as well as the Colliseum increase various cultures (Illyrian, Balkan, German) etc... Although I like the 50 year minimum conversion timetable and high tension, this can be scaled after all the other factors are accounted for (i.e. conversion traits for generals, diplomats, etc...)
Here's a link to a beta version on Steam:
https://steamcommunity.com/sharedfil...?id=1214120317
This one roughly doubles the DeI default values and halves (or thirds) the conversion. There are some new values in the beta that will probably affect this once the final version is released but this one is good for testing.