Oil Pump

Take a hose , put a .040 restriction in it and apply 25 PSI. Time it for 30 sec into a container. Then apply 70 PSI for 30 sec and see how much is in the container. There will obviously be more.
Now think of that .040 restriction as a clearance in the engine.
If you have a standard pump making 25 PSI at idle and then you put on a HV high pressure pump and it's making 50 PSI at idle, then obviously that's going to push more oil past those clearances at idle.
As I said, in some situations (and as we know, all engines are not the same) HV High pressure pump can cause an issue.
In the Engine Masters test shown earlier in the thread the GPM (Gallons Per Minute) tells the story. If nothing changed by going to the HV high pressure pump, then the GMP would not have changed.
If its passing more GPM, it's got to be going somewhere.
Just sayin..