Problem With Dual Counterbalance Valve

Good day Sir,

I got problem with dual counterbalance valve . My dual counterbalance valve comprise 2 relief valves. The valve is mounted direct on motor of the winch, and its position is between the motor and the tandem directional valve. there is no problem as the load is light. As the load is heavy I must tighten one of the screw for adjusting pressure of system, and the winch can raise up the load, but as lowering the load, the winch can not operate smoothly. And when Ioosen the screw, the winch can lower heavy load smoothly but it cannot raise up the heavy load.

So, please guide me to adjust two of relief valve for operating smoothly of the winch both of heavy and light load . Does I use the tandem directional valve effect the un-smoothly operating of the winch? I should replace type of open directional valve for tandem type ?

Thanks you very much