I like the buffs mentioned in this thread: The survivability buffs Sym needs (not 250hp)
Particular the improved shield hp regen and decrease of her head hitbox. These two buffs would hardly be powercreep and could make playing her just a little bit more reliable.
And reverting the TP change, that would be the best buff in my opinion, haha.
I do think her primary fire has been the weakest part in her kit and wished they would try out averaging the damage ramp up into 2 stages instead of 3, to increase her minimal damage, but decrease her maximum damage, which should hopefully also make balancing it easier.