Problems with medium-pressure boiler water level gauges

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The medium-pressure boilers used in our plant are equipped with two dual-color level gauges, three balance vessels, and two electric contact level gauges. The dual-color level gauge and the electric contact level gauge are installed on each side of the steam drum; one balance vessel is located on the left side, while two balance vessels are located on the right side. In actual use, the center point of the dual-color level gauge is lower than the geometric center point of the steam drum. The two dual-color level gauges have an indication error of about 10 mm; the left side of the balance vessel is 30 mm higher than the right side. The range of the dual-color level gauges is -150 to 150, while the range of the balance vessel is -300 to +300. Do anyone have any good methods to address this deviation? Feel free to share your ideas.