I think PA doesn't need a buff.
I mean, it's nearly unused, as Higs said, why should we nerf it? Because it can be nasty? Because it helps stalls? (not THAT much actually) Stalls are already overshadowed by rushes. It needs a 2 card combo, that although makes a permanent, well, permanent, it always has a way around. Now you can even destroy PA'd weapons. You can bypass shields with high attack, poison and momentum, and you can deny quanta if your towers are PA'd.
Also, the counters to PA are far more common than the card itself. Momentum, Ice Bolt, Poison, BH/Discord and even pests. So why we should nerf a card with so little use? I nearly consider it UP, but for balancing sake, I agree it's OK.