Soroka buff

So I've been playing Soraka on and off since her rework, and I feel that she needs a slight buff. Her W heal just seems to cost too much - 10% of max hp and mana - for the amount it heals. While I like her set, landing Q's to heal yourself and hurting yourself with W's to help your team. So I feel that she needs to either heal herself more or harm herself less. Nowadays Sona can do Soraka's job, plus throw in a shield, burst down a squishy, and build a little tanky...while poor Soroka hurts herself even more if she builds health and can't even shield allies like can or restore mana like she used to.