Need help with adjusting my dual station controls. My system is the older model w/o actuaters. Purely mechanical 4 cables in (2 shift, 2 throttle) and 2 out ( 1 shift, 1 thottle) to motor. The dual station units are set close the motors, within 8' feet. Need advice on adjusting for smoother shifting. When I engage the throttles only they smoothly. The problem is in the shifting? Thanks