Turbov6.30

Pump pressure and area are inversely related. If you increase the area (size) of the pump pressure will decrease. If you increase the pressure but pump size stayed the same then the volume of oil pumped will increase. This true with turbo, supercharger and oil pumps, it's the reason you can go to a bigger turbo at less pressure and make the same power. If you increase the area of the pump it reduces the pressure and increases the volume of air but say you stayed with a smaller turbo. You would have to increase the pressure to get the same volume increase. Same principle applies to your reason for wanting to use the DE oil pump over the E oil pump.

I've built this engine using a VG30de crank with the snout machined back to work with the VG33 oil pump. It's not big deal you just have to sleeve the snout of the crank to deal with the groove that's will be left after machining. You can still use the VG33 oil pump and a rear oil filter if a groove is machined to connect the inlet and outlet on the pump where the oil filter adapter bolts on. You only need to fab a plate over this modification for it to work. If your concerned about the volume of oil the engine is getting then shim the spring in the pump to increase oil pressure.