Feed the throttle gradually on take off. This way the torque won't try to turn the model to the left. By the time you get to full throttle, you'll be going fast enough that the rudder will have good effect. Planes are like people, they all have they're own little quirks and you have to learn them. You say it jumped off when you gave it elevator, so give it a little less next time. Trikes need to sit a little nose high when sitting still so that it doesn't take much elevator to rotate at take off. When its taking off with the nose down,as with a short nose leg, it's like having down elevator in it. To get past that you have to give it more than normal up elevator so it appears jump off the ground. Hope this helps.