Here's a thought on GG:
- Restore his old penalty for killing lower-level monsters, however he no longer gives or removes piety for killing higher-level monsters. Remove the silly "burning offering" piety gain.
- The cleansing boon now grants an effect similar to sanctified kills. You gain +5 piety for every monster killed until you gain or lose piety from another source (Pactmaker Pacts, boon requests, and sparkles exempted).
- Raise the piety cost of humility to 20, absolution to 40, and lower the cost of enlightenment to 60
This would restore a sanctified kill mechanic to GG, but you'd have to tread carefully because any source of piety gain or loss will end your sanctified streak, and every time you activate cleansing the cost increases by +5 so you only get so many shots at this. This would be a piety gain mechanic equally accessible to both high and low-level characters, and forces you to be observant both of what GG likes and dislikes.