Holy crap! What are you feeding that Texas? Are you and your husband both over 6'6" tall? If so, there is something unnatural in your food/water supply down there! lol
Those are amazing fish!
I have some tank busters too, and the older they get the more "aware" they are I think. You know, this might sound weird, but as they get older I think they get bored. You might try putting a ping pong ball on top of the water and just leaving it in here. I'll walk in and see my fish playing around with the ping pong ball.
I also have a pair of jags who get bored. They don't mess with the ping pong ball but sometimes they decide to move all 200 LBS of gravel to one side of the tank. When their done, they move the gravel to the other side of the tank.
Judging by the color and size of your fish, you don't need to worry about the diet your feeding them, or really anything else. Just keep doing what your doing. And remember large, older fish like that really just need more "entertainment" than others...