FGei is dependant on both winrate and speed.
That's the reason GotP won't get a super high FGei, since its so slow. It wins a lot more than all other farmers, but in the time it can win one game, decks like RoL/Hope can win 2. In your case, your win% doesn't justify the massive amount of time you spend on each god. You're playing less than 10 gods an hour with that speed, while RoL/Hope can play around 25ish (Depending on loss speed)