Currently, melee units are weak compared to ranged units. The pathfinder is still problematic and ranged units have advantages with that. Melee units do not have the distance and pathfinder in your favor, so it seems fair that they have less xp requirements for promotion. This should improve the melee units without having to change other attributes.
- Ranged unit requires +25% promotion experience.
D1977 is very important and need be committed.