The pressure seems a bit high for that setup so that might have something to do with it. Does the pressure gauge go to zero when the pump shuts off?

Assuming the gauge is correct, the pump's operating point is around 42 GPM @ 54' of head. The 244T is a 3.1 sq-ft filter and it has a design flow rate of 62 GPM so the flow rate from the pump is fine. I would focus on the filter. Given the pressure, something is still not right.