Please don't put the idea of solo-Q-only FL into the devs' heads LOL. As it is, the reduction to a 4-stack max means I can no longer queue FL with all my friends who want to play, and FL without friends is honestly kind of depressing and pointless. DRK/DRG isn't the only issue, you should see the degeneracy that some other DC's get up to with PLD/DNC stacks, or even the SCH stacks you mentioned. The ole SMN Baha Blast is still around too. As someone else suggested in another thread, globally capping AoE at 5 targets might be a good start, although that might run into an issue of trying to fairly randomize who gets hit by each AoE button.

As it is, FL is just fundamentally broken and unfixable when the entire system overhaul was built around CC. I know some people have been clamoring for the return of Fetter Ward, but I'm honestly not sure if that'll fix the problem. SE definitely painted themselves into a corner with the rework and it shows pretty clearly that they don't care about what happens to FL--PvP is only a collateral duty of a small number of staff, after all.