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if the rotors have been damaged then the turbulence from that damage is probably slowing the rotation speed down and the electric motor is not powerful enough to get it any higher
file any burrs off or get replacement blades
Have the same problem with my S107 heli. I determined it's in the speed control hooked to the gyro control. This control feature helps keep heli from turning in flight caused from tork. The lower blades are the ones that speed up slow down to keep heli orientated. I'm replacing the control board.
The upper shaft 'T' head has a broken pin in it (the part that holds the blades. You can flip the heli upside down and slightly rotate the blade housing back and forth and IT SHOULDN'T do that. Another way to instantly identify it is dislocate the rotor head links and the upper blade housing should instantly separate) It's made of plastic.
Anyway, It's also called the "T.B.E." Toilet Bowl Effect. It's not 'really' what's taking place, it's move of a cyclic issue but the effect looks like it's swirling in a toilet bowl... You need to replace the inner shaft basically on the upper rotor. They cost anywhere from $4-7.00 bucks. It took me about 2 days of researching and purchasing another one to finally figure it out. There was another website that says the balance bar is it or the gyro has gone bad; this simply isn't true.
Make sure the blades and rotors are free of debris. I had the same problem then noticed hair had gotten wrapped around the blades. Once you remove the hair or thread or string or whatever it should fly fine