What I'd like to see:

-Melee combo now costs only 70 black/white mana to fully perform instead of 80;

-Verflare/Verholy no longer generate mana, instead uppon usage they put you into a black/white stance(Verflare for black instance; Verholy for white), while in the black/white stance, increases the damage of all black/white mana generating spells by X%.

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Explanation: a simple change that doesn't really change much about the class, but makes the gameplay a bit more challenging as it forces you to play on the limit of the balance gauge to pull out more damage. Ideally you'd want to use as many black/white spells as possible during the black/white stance but without letting the disparity of both manas grow beyond 30, on a perfect scenario you would go for the melee combo with a 100/70 mana ratio, which would also give you a lot of room to spam the black/white spells once going back at range.

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Another idea I have but that's still very green in my head is letting go of al the procs. All the skills can be used at all times, but then make our black/white mana generating to be a bit more... chaotic, like gaining or losing mana at random so it would be a struggle to keep both manas balanced, but then you'd be reward with extra damage the closer the manas are to each other.

This idea however would require a lot of core mechanics of the class to be changed, so I doubt they'd go for something even close to this... but hey.