I didn't think it was good idea to swap front and rear tires. It's better to have more grip on the rear tire to stop oversteer, it's better to understeer which will force you to slow down in the corners (until you get two nice new grippy tires).

i think your concept of over/understeer is off a bit, if you experience either on a road bike with any regularity you belong in a straight jacket, prison, or a coffin.