Can you drill a low water pick up lower and make it a dual water pick up? I heard this would help with high water pressure. Any pros or cons.

Yes you can drill it. And then plug some of the slots below or close them off completely. Make sure you cut reliefs on the front of the holes. Dont drill so many that the height is above the water. With high X, I plug the two top holes and still get enough water. Play with it and see what it does..
Dick