Right now I am building a quadcopter using the KK2 board. I am experiencing issues with roll and pitch. Motors 2/3 are not speeding up when I apply elevator or aileron but they do speed up when I apply rudder. Also, 1/4 spin faster than motors 2/3 causing it to roll right. As soon as throttle is increased above 1/2, motors 2/3 start to react to elevator and aileron. Do any of you know how to fix this?