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There is no speed adjustment. You can adjust the pressure all day long and it will not help. Your problem is your flow not pressure the piggyback pump on the back of the drive pump has worn and is not creating the flow that it needs to perform at optimal speed. I would replace that aluminum pump.
I have never adjusted the speed on the circuit board that is preset from the factory I still think your piggyback pump is worn
found some more info let me know when your around the lift.
Under the upper controls there should be some adjustments you can do to ramp up the speed.Have you adjusted any of those yet?
Which circuit board the one under the upper control panel?
If you have voltage going to the board and it is not changing when you adjust the pots. I would start with a board if it was me if that does not solve the problem my next cause would be that pump. What is the color of the hydraulic oil?
Ok please update me when you get it going and please rate me when you have a chance