What a wonderful foodie vacation! I’m familiar with every place you’ve stopped (including Ted Drewes and Ragazzi’s) and you’ve come close to perfection.
That being said, two suggestions–
1. if you’re still in San Antonio tomorrow for lunch or dinner, try Schilo’s Deli, close to the Riverwalk but not on it. Many amazing things there. But get off the Riverwalk, which is wonderful to walk on but mediocre food-wise.
2. If you can slide over east of Austin/San Antonio, I cannot recommend Round Top Cafe highly enough. Google it. Go.