No, it’s completely fine.
Sparks healing output is already super powerful, no need to buff it further.
She is the medic who can patch up 130hp mercs and less the fastest.
She can do that once per spawn and still have 3 packs for herself.
For everything else there are kill revives, which are also a lot better on her than on any other medic due to range.
It was nerfed some patches ago, to avoid players using medpacks only for themselves. Suprised you didn’t noticed this yet ^^
SD has changed the HP given to medics (including herself), not the cooldown.