A method, comprising: developing, at a main regulator valve, a main line pressure having a first pressure level, the first pressure level being greater than a threshold pressure level by a predetermined amount configured to overcome at least one anticipated variation in the main line pressure such that the main line pressure remains above the threshold pressure level during the at least one anticipated variation in mainline pressure; developing, at a control main valve and based on regulator control signals, a control main pressure based on the main line pressure; adjusting the main line pressure from the first pressure level toward a second pressure level, the second pressure level being below the threshold pressure level by a predetermined amount configured to overcome the at least one anticipated variation in the main line pressure such that the main line pressure remains below the threshold pressure level during the at least one anticipated variation in mainline pressure; determining, from a status signal indicative of whether the control main valve is in a regulating state or a non-regulating state, whether the control main valve has transitioned from a regulating state to a non-regulating state, wherein the threshold pressure level is associated with a transition point between the non-regulating and the regulating state of the control main valve; generating one or more first calibration parameters in response to determining that the control main valve has transitioned from the regulating state to the non-regulating state; adjusting the main line pressure from the second pressure level toward the first pressure level; determining whether the control main valve has transitioned from the non-regulating state to the regulating state; generating one or more second calibration parameters in response to determining that the control main valve has transitioned from the non-regulating state to the regulating state; and using the first and second calibration parameters to calibrate the regulator control signals and adjust the main line pressure. developing, at a main regulator valve, a main line pressure having a first pressure level, the first pressure level being greater than a threshold pressure level by a predetermined amount configured to overcome at least one anticipated variation in the main line pressure such that the main line pressure remains above the threshold pressure level during the at least one anticipated variation in mainline pressure; developing, at a control main valve and based on regulator control signals, a control main pressure based on the main line pressure; adjusting the main line pressure from the first pressure level toward a second pressure level, the second pressure level being below the threshold pressure level by a predetermined amount configured to overcome the at least one anticipated variation in the main line pressure such that the main line pressure remains below the threshold pressure level during the at least one anticipated variation in mainline pressure; determining, from a status signal indicative of whether the control main valve is in a regulating state or a non-regulating state, whether the control main valve has transitioned from a regulating state to a non-regulating state, wherein the threshold pressure level is associated with a transition point between the non-regulating and the regulating state of the control main valve; generating one or more first calibration parameters in response to determining that the control main valve has transitioned from the regulating state to the non-regulating state; adjusting the main line pressure from the second pressure level toward the first pressure level; determining whether the control main valve has transitioned from the non-regulating state to the regulating state; generating one or more second calibration parameters in response to determining that the control main valve has transitioned from the non-regulating state to the regulating state; and using the first and second calibration parameters to calibrate the regulator control signals and adjust the main line pressure.