I've notice, if I'm getting MASSIVE understeer such as that I will crank the tires and slam the gas padel (90% of the time it works)
as for the ebrake ordeal, it has saved me many times, if I'm getting massive oversteer I will slight pull it up to break out the back end, feather the gas pedal and usually pull out
and when I pull the e break and slide WAY to much, (when I'm just about to pull a complete 180, I will crank the wheel in the direction I want to go.. and slam the gas, and 95% of the time the car will straighten out (maybe its the winter tires?)
plus I've tried alot of experimenting in parking lots.