Falcon and Amistad were both 30+ feet below full pool 10 or so years ago during a long drought. Tons of brush grew in the area formerly occupied by the lake. The lakes have been at full pool, or nearly so for about 5 years and the lakes are now incredibly fertile. Coupled with fairly low pressure (Amistad is in the middle of nowhere) the fishing is outrageous.
I fished Amistad 12 years ago when the fishing "stunk". In a week of fishing just by hiking around the bank, I caught several 7 pound fish and many, many smaller ones. And that was in July, probably the worst month of fishing with temps 105+ everyday.