i know not everyone can run this way but here is what I did. Works great. No Power Steer pump issues at all.
These are the best pictures that I have. All I did was mount my res. to the head of the motor so that the outlet of the Res. is directly on top of the inlet of the pump. The "hose" is just the length of the two barbed fittings. One bard almost touching the other. NO way the hose can collapse the hose or that the pump would starve unless the res. is empty.
I am running a PSC 1500 series N pump, PSC Gen IV 6" reservoir with -12 feed and -8 return. The cooler has -8 fittings also. The valve is Charlynn Eaton 120CC. PSC 2.5" DE cylinder. I am running the thick blue Elixr fluid. All of the steering except the cooler was recommended by and bought from WOD. The thing steers great and is quiet as a mouse. There is a 90 degree feed fitting at the pump. The only -4 in the system are the two lines to the ram.
Me? Nothing that I would call definitive so far. One of my pumps uses a specialized custom inlet fitting that I built myself. I modified it so that the return goes straight into the inlet and it seems to have fixed it.
The other pump uses a quasi-normal -12 inlet fitting and I used a t-fitting to replicate what I did on the other pump so that the return line shoots straight into the inlet. That helped a lot but it still cavitated at higher rpm's so I pressurized the tank to 15 psi using OBA and a small regulator. That fixed it.
I realize that both of these "solutions" are red-neck and not ideal but I am still experimenting and they may not be my final solutions.