The power required to run a pump is proportional to pressure x volume. As the pressure increases in your tank, the volume drops off. If you were to connect your pump to a valve and an open pipe, you would find maximum current draw when the valve is fully open and minimum draw when the valve is open.
It makes no sense to try to adjust power factor under no load. The whole point is to lower the current requirement, so you want to do it under a typical load. Let's take the extreme case: you have the motor disconnected and add capacitance to the power source. Immediately the current will increase because the capacitor by itself has a very low impedance. Now you may be adjusting the power factor for the rest of your house, so the current at your meter is less, but it's not doing anything for the motor's PF, since the motor isn't even in the circuit.
I suggest you pick up a "Kill-a-Watt" meter; it's the cheapest way I know to measure power factor.
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Today's Featured Article - History of the Field Marshall Tractor - by Anthony West. Any restorer who has some knowledge of turn of the century farm machinery, will recognize the name Lanz Bulldog!! This machine was to say the least unusual in its appearance. The huge flywheel and coffee percolator shaped exhaust. Along with square body lines and cylinder head protruding forward of the front axle. Would become the visual differentiation that people would quote to separate the Lanz from other period machines. The Marshall company based at the Briannia Works in Gainsborough
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