A 30/0/0/20/20 DPS oriented Cantrip Build (ofc max'd boon duration runes)
I was actually thinking going 30 fire on Staff, kinda doesn't work for me with d/d because I'm used to having condi removed with water but for a staff it could work.
I would change Soothing Disruption for Cleansing Wave just to help out while Cleansing Fire is on cd. And I would change Spell SLinger for Internal Flame and change Internal Flame on the 2nd tab with Pyromancer's Alacrity for faster skill recharge.
Alsso I find Lightning Flash to be situational so I would consider having Armor of Earth as a backup because stability is gold!
Also for Weapons I'd go Sup Sigil of Energy and maybe some toughness or vitality runes with Knight's/Valkyire armor and Knigt's Jewels. You might also want to combine some prec runes aswell or go most with prec runes. Would be very balanced and do plenty of damage from distance. I could see that work.
Also would work well in a combo with Guardian's Empower