Toe out in the front will absolutely decrease
on power steering. It will increase off power steering entering a turn.
Rear toe will keep the rear end under the car. If you have too much it will make the car push on power. This is a rotation issue and used to hold the car under control. I like running as little as I can to make it the most efficient.
Not sure about the diff oils on this car. I would look at the Jammin post to be sure. Trying 5-5-2 would not hurt.
Increase your front castor.
Increase your front kick up.
Decrease your front toe out. Make it more straight.
Soften the rear of the car.
Decrease your front track width.
Stiffen your front sway bar.
Hope this helps.