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If you have a more than capable pump, well pressure is determined by the pressure switch settings. here in Georgia, BORED wells (26 to 30 inch hole in the ground, 40 to 60 ft deep) are serviced by a jet pump on top of the well and usually a 20/40 pressure switch. ie. When the pressure gets down to 20 the pump kicks in, and when it reaches 40 psi it shuts off. The nitrogen/air charge on a bladder type tank must be set properly depending on the pressure your pump shuts off at. Since it is also possible to have 30/50 and 40/60 systems, you need to know what you have and that it is working properly. In short, you cannot change the pressure of your system by changing the pressure in the tank, it is merely an accumulator to store the water. The larger the tank, the less often the pump runs, but it runs longer, which is good, starting and stopping is hard on a pump and motor, you want it to happen as infrequently as possible. The pressure is usually set at about 5 psi less than your pump shutoff pressure. The larger a tank, the more "drawdown" it will have. Drawdown is the number of gallons you can get out of a tank from the peak pressure the pump shuts off at to the point where the pump starts up at the low pressure point. Here is a real good site to find out info about your well. Link
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