The astronomers then conducted an analysis called a Bouger correction in order to subtract the gravitational effect of topological features, such as valleys and mountains, from the total gravity field. What is then left is the gravity field hidden beneath the lunar surface, existing within its crust.
There is another aspect from the moon that is also going to improve your success and that is the moon rise and moon set. As a fishing angler you already know that some of the best times to fish are early in the morning and late in the evening the rising and the setting of the sun. Well the moon rise and moon set affects a fish's activity in the same way and since the moon has such a much stronger pull on the earth its effect is even more dramatic then the sunrise and sunset.