Any good stories that revolve around the geopolitics and conflict with Griffons? I've read Steel and Wings and also Tears of Gaia.

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Wind and Stone is interesting. Dark though

Good trooper Gilda is a fairly decent one three different stories so far

My two recommendations don't directly concern griffons and geopolitics at their core, but those subjects do come up within them.

The Dusk Guard Saga: Beyond the Borderlands by Viking ZX
Heart of Gold, Feathers of Steel (and sequels) by Nicknack

Both of these recommendations are series, so it's not gonna be a quick affair getting to the griff worldbuilding. That said, the ride to get to these places is quite fantastic and definitely worth your time!

Feathered Heart by Demon Eyes Laharl.