Sorry, I didn't read the entirety of the post but I still feel the need to answer because it seems you have the same problem as I had. But the good news is:
It's only in Main Scenario dungeons. Every other dungeon still has the good ol' tactic-y feel, even if you can speedrun them, you still have to pay attention to mechanics and teach/learn tricks, etc.
So don't worry too much about those 2 silly dungeons

Although, I wish Square would change them somehow so this doesn't happen (Lower the ilvl sync to 50, MWAHAHAHAHA)