The restrictor devices are the best you can hope for. And they work fine if properly used. Just be careful about pinching down the flow too much.
I don't use restrictors on my Grapple. It used two 2"x8" cylinders. My M9540 has considerable flow. They can be slammed open or closed. If I'm wanting to be gentle I can "tap" the joystick buttons and regulate it pretty well. Just takes practice.
To have a Grapple is worth the learning curve of controlled use.
For clarity, understand, a diverter system uses your "curl" function on the FEL to operate the Grapple. So it has delicate control by a steady hand on the joystick. What you sacrifice is the ability to do both functions at once.
The system we're discussing here is operated by electric over hydraulic valves. They only know "open" "closed". The gain is multiple simultaneous functions.