As has been previously posted, this would be decidedly unfair to players playing through these dungeons for the first time. Keeping long rotations would mean insanely high DPS in lower level dungeons, even if you lowered potencies. All potencies would have to be researched and customized for different level sync's if you wanted to keep DPS at a fair volume. Can you imagine being a level 30 PLD in haukke manor with only Sword Oath, and having a ninja unload a toploaded dps combo on a boss? It wouldn't matter how good you were, you'd be at a huge disadvantage.

The only way to fix it would would be to blow out the potencies to an obscenely low level and that would require alot of research that would be better focused on making better endgame content.