It seems to me that the Agility Skill is not balanced with Survivor and Power skills. Agility XP adds up VERY slowly for my style of play (cautious, explorer). So I found a way to increase the XP gained by performing agility actions.

There are now 3 versions of the mod, pick your poison:

BalancedXP Agility Skill Mod
This is the original version of the mod. Balances Agility XP to be more in line with the other skills.

TripleXP Agility Skill Mod
This version triples across the board the amount of Agility XP earned.

InsaneXP Agility Skill Mod
Use this version if you need to catch up to your other skill levels.

Installation:
- *WARNING* If you are using any other mod that has changed your original "default_levels.xml" file, this will overwrite those changes.
- Extract the zip to Documents\Dying Light\out
- Profit

Removal:
- Delete or rename "default_levels.xml" from Documents\Dying Light\out\data\skills