Was wondering if anyone new where to find the files that determine how much anti-matter used for a phase jump...
Since this is universal, it would either be in the player entity files, or gameplay.constants. My bet would be player entities.
Also is there any way to change the percentage of artifacts/bonusus for planets? For the all maps, not just the ones you make in GF...
Nope, it has to be defined for each map. You can manually edit all of the existing maps, but it can't be done globally since it is map-specific.