What you are feeding is a good basic diet.
Do you feed fresh foods at all? Some safe tree branches, with our without leaves, vegetable trimmings, the occasional piece of carrot or apple, outer leaves of romaine etc. are all good things to add. I don't know how the winter vegetation is in your part of Texas, but see the Safe Plants List for ideas. Always, with rabbits, make changes slowly.
safe-plants-for-rabbits-list-t55.html
Edited to add:
Sprouted grain and BOSS are also excellent additions, whether just sprouted or taken all the way to fodder.
fodder-sprouting-systems-anyone-t10317.html