You might want to watch "Michelin on Megafactories" for the over inflated tires vs stopping distance test.
Couple things:
They are ANTI sway, as in help to prevent sway. They do absolutely nothing until there is a side to side difference in the suspension.
Since I'm not entirely clear on exactly what the issue is, it is hard to say if they will do anything for you.
Increasing toe in generally helps "wander" at the expense of tire wear.
159.00 EA sounds pretty cheap for alloys. Make sure they are really the correct fitment (IE hub-centric and truly correct offset). I would take factory 15 inch steelies over cheesy aftermarket ill fitting 16 inch alloys any day.
IMO forming a complete description of the exact problem will result in more useful relies, and I do agree a car specific forum may yield better results.