How are you applying power to take-off? The way I would take-off with my Cubs (full-size as well ):

o Full up elevator
o Right rudder
o Apply power slowly until some speed is built
o Slowly let off the up elevator as speed builds
o Keep right rudder as needed for wind and tork (P-Factor)
o Lift her off the ground when the tail is flying and rotation speed is acheived

Hope this helps.