Hi There.
I have been flying for 30 years. sling the throttle open on any plane and it will make a turn. I have been training my 9 year old son on a P 51 PTS, we have 30+ flights on it with no trouble with take off or landing. Ease into the throttle, it should take 4 or 5 seconds to get to full throttle and it will take off with very little rudder. Just my opinion.