I'm no expert but I do know you can't "horse" a Cub into the air and you don't "drag race" it down the runway either. Nice and easy taxi and rollout until the tail wheel lifts then gradually increase power and it should lift off on it's own provided the control surfaces where adjusted neutral . You should be on the rudder to keep it straight while on the ground and as it lifts off be ready to add some right rudder if needed. Then increase power and fly it out. If the plane was built correctly you should go with the stock settings and alignment. Once in the air and trimmed see now it flies and takes-off,