Hunts are fine the way they are now, abet a few minor changes.

1.) Add more random B Ranks. Increase full credit Allied Seals to 10.
2.) Increase the HP of A Ranks by 100% and Damage output by 10% and make them wander around some. Increase full credit Allied Seals to 75
3.) Make it so the S Ranks, that once spawned, Walk around the Zone, and Increase S Rank HP by 100% and Damage output by 25%. Increase full credit Allied seals to 175.

With these changes B ranks will be more so for the Solo players, while A ranks will be for the Light to Full Party, and S Ranks for the Alliance.

All the proposed Hp and Dmg changes are rough guesses on what would be a acceptible fix to the problem.