Only the VF has the flow rate mode so it depends on the Intelliflo model. But with single line 1 1/2" plumbing, the flow rate should be close to:

Flow Rate (GPM) = RPM / 48

I would set the pump at 1000 RPM because that is the most efficient setting. Then run the pump for a turnover, ~12 hours, per day to start with and see how that goes.