After some testing I think the top decks, at least in Platinum League, need much, much better rewards. If you were to take say the top 10 decks and give them even better rewards than they currently have (I know they already have better rewards) things might balance out. Currently the decks are harder to counter than most fgs, especially since you can't even predict what they will have. I say only the top 10 since this would prevent ridicule rewards from facing low ranked farms.