Totally random idea, but what if we gave Q some ability where Gwen can trade life for more damage? Maybe something like:
Q: 0.0 spd, 8(+4)dmg, +3 any
Brutal Strikes [During Combat]
Take 2 damage every time you pump this card.
Does that feel rush down-y while giving her access to a more threatening DP?
EDIT: The ability could also have a clause that says “You may pump attack even when it ties with another attack.” This would prevent characters like Grave from completely defusing it by playing their own 0.0 speed DP.