not an ABS issue, if anything locking up the front can sometimes help in that situation.
by putting ur foot on the brake ur throwing the car's balance out, can be helpful in a drift situation done well, but unless u know what ur doing its almost always going to make the situation worse.
my advice is to get urself out to a few grip and drift days, both will teach u different skills, both very valuable.
btw, imo driver training is useless for those kind of situations, they will teach u things that you can use in day to day driving, but as far as heavy situations ur subconcious takes over and does the work for you, one day of driver training will not train ur subconcious, only repeated days at the track practicing it all will.