RTO at low speed is one of the most difficult manoeuvres even the most experienced pilots have to perform. Low speed, little airflow over the rudder and high power from one engine whilst the other has failed can make the aircraft a handful to control and keep on the runway let alone straight. Can I suggest you consider having your feet up on the rudder pedals and not heels on the floor and then use differential braking to assist in trying to keep the aircraft straight and on the runway. As mentioned above, ask the institute demonstrate.