I did raise this sometime in chat before I believe, but nobody paid much attention to it. I work on an exclusion principle though, let me give you an example:
Add 4 new FGs for a total of 28
Divide them into 14 pairs. Each pair should have FGs with contrasting playstyles, ie Hermes-Ferox, Miracle-Eternal Phoenix et cetera.
Each week, 3 pairs are excluded from the 28. These 3 pairs are selected on a rotational basis.
Furthermore, the player opts to exclude another 3 pairs at his/her discretion.
End result: You fight a random FG out of 16, and retain some control over the sampling.
I agree with Puppy on the counts that: 1) we are supposed to be building generic anti-FG decks and 2) the current 24 FG scheme is a little too tough. Personally, I feel that something like my suggestion above would allow us to toggle the decks a little more specifically, but not to the extent that we can just create decks for the sample (somebody mentioned PAed elec) and/or there is too much disparity in the rate at which people grind FGs.