Honestly, Just Revert Syndra's Q Passive

Put her Q ratio back down to 0.6 and revert the passive (from extented Q duration to bonus Q damage).

Until we can figure out how to give Syndra more spheres on the field (for kit synergy) and a more reliable access to 7 spheres ultimates (with the right setup and without making it too easy), I think this would put her back where her ult is at least less frustrating for enemies.

All the suggestions for changes to her Q passive or R that I heard would just make her way too unreliable as a burst mage or just double down on her bad matchups against mobility.

With the passive reverted, we could see where to move from there better.