The second activation on Lee Sin's spells should be unlocked by putting a point into his ult.
At level 2, he has 4 spells. No matter the jungle, no matter his opponent, he's going to shit on their face. Then at level 3 he has dash dash slow shield reveal sustain execute.
You can't balance someone with twice as many spells as everyone else when other people need to put their first point into their jungling ability and have 1 point left to deal with the inevitable invasion.
Even if you nerf his endgame into oblivion like Shaco, he's still going to win every invade and every low level gank.