Still too early for me to say. I have a huge abundance of gpt atm (I think like +430), but I've been in the +200 number before your mod was released, and it usually regulates itself as Civs decide that they hate me lol.
As for happiness, tbh I'm still a little confused by the mechanic. I've had periods where it fluctuates drastically from one turn to the next in every game without me really knowing why. I know that the calculation changes when you get a new tech, but I don't know the specifics. In this game, I had like +13 happiness for a few turns, then it dropped to just +1 for a turn or 2 before going back up. Not sure what it's at atm.