The "tip stall" is not from engine torque. It is due to an uncoordinated stall. This means that when you reach the stall your slipping or skidding (depending on if you are in a turn or flying straight.) The tip stall can happen with any throttle setting, but most often happens in a high "G" turn or low speed high throttle setting. The stall in a turn snaps due to improper rudder control and is aggravated when opposite aileron is applied, this can be seen in the photo of the push pull Kadet. You will see the rudders are neutral and the aileron is down, increasing the AOA, and making it more stalled then the up side. The low speed stall with high power is due to the improper amount of rudder being applied to counter "P-Factor," or the left turning tendency of the prop at high AOA's. A "tip stall" is caused by stalling with one wing trailing slightly during the onset of the stall (in full scale this is why it is important to keep the ball centered.) The trailing wing has a slightly higher AOA causing it to stall more. The best recovery is to drop the nose to decrease the AOA, opposite rudder and throttle up to gain airspeed. Keep the ailerons neutral until flying speed is achieved, then roll level and pull out of the dive smoothly. The best way to avoid all of this is as others have stated, 1: keep your speed up. 2: keep just enough elevator to give a smooth full stall on landing. 3: use low rates if nessessary on the elevator when at high speeds. 4: Practice stalls and recovery, at altitude, as this will help you recognize the onset and train you to recover. 5: Above all learn to use the rudder properly.