Remove Glitterlance's Damage Reduction and replace it with 70% Reduced Damage to Minions
######EDIT: I intended to write title as "Remove Glitterlance's Damage Reduction and replace it with 70% damage to minions". But now it's too late to change it.
In Patch 6.13, Lulu had the following adjustments to Glitterlance:
Q - Glitterlance NEW LESS LANCE MORE GLITTER: Damage now falls to 70% against targets hit beyond the first.
The intention of this nerf was to redirect Lulu more towards her intended role as a support without damaging it and giving her midlane role some counterplay. While this might have worked, it has decreased her poking capability because the smart ADC will stand behind their minions and thus reduce damage taken. Her main source of damage suddenly deals 30% less damage and it has been difficult for Lulu to keep up with other support mages.
As the title states, it would be a far better idea to adjust her Glitterlance to deal 70% damage to minions. Thus keeping the nerf to her solo lane, but to deal full damage against champions and making her pokes worthwhile.