You should find out exactly what you need first, perhaps from the skimmer manufacturer. Unlikely you need 4000GPH but a pressure rated pump may be better if the Beckett is that restrictive. So rather than trying to find something rated at 4000+ gph in higher pressure pump, which you will have a hard time finding, you may need something closer 2000GPH. If the manufacture of the skimmer can't give you any suggestions then measure the pressure in the line from the pump you're running now and line it up with the pump chart to get GPH. If you can't do that then measure flow rate from the skimmer and line that up with pump chart to get pressure. Once you have your current GPH and pressure you can compare that to other pumps to see what you need and if there is any advantage to switching.
For higher pressure rated pumps Panworlds come to mind. Little giants are smaller, likely significantly less capable of what you're running now.
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