Yes, it is possible to lower your power output as a strategy to reduce the size of an overlap zone when applying for a second adjacent channel waiver. Adjusting your power output can help minimize interference concerns and improve the chances of obtaining the waiver. However, it's important to ensure that the reduced power level still complies with regulatory requirements and serves the intended coverage area effectively.
Keep in mind that the combined factors of your height above average terrain (HAAT) and effective radiated power (ERP) must not be reduced to the extent that it would result in a service contour covering less than 4.7 kilometers, which is equivalent to 50 watts at 30 meters HAAT. This minimum service contour requirement ensures that your station continues to provide an adequate coverage area while operating at the reduced power level.