Aren't the EDP's positive displacement pumps? The question to ask is not what pressure it reaches when turning at low speed, but what will happen to that pressure if you put any demand on it.
You now have me recalling my DC-10 days, the electric pumps would often fault a full A/P systems RTS when used. 2 electric pumps feeding the two RMP's could not maintain the pressure upon demand. It was common practice to dry motor #2 engine, the output (volume) was much greater.