I put an OS 52 4 st. in my Smith Mini plane. Last year when I tried to fly it it torque rolled as well. A little damage the first couple of times and then I destroyed the lower wing. So, I rebuilt it and on the advice of RCU members put a couple of degrees right thrust into the motor. The plans called for 0. Getting up to take off speed, as suggested is also important. Ok, so I took the little bipe out to the field a couple of days ago and with my heart in my throat I decided to give it a try. Another piece of advice I followed was this: Don't hold any up elevator just b3ecause it's a tail dragger. Just throttle up slowly and steadily and let the tail come up. I did and I think she took off with very little elevator input. Climbed out absolutely level and beautiful. Now, I'm not sure this will work for you but I can sure appreciated the problem you're having. So you might want to check the thrust angle on the motor, it sure seemed to help me.