I've been an employer in the Austin area both at startups and a very big company. My gut tells me you're right at (or slightly below) the median range and probably right where you should be. Without knowing details, and assuming you're 7 years into your career.
Things you can do to improve your salary:
1. Get a new job.
2. Improve your written communication skills.
Regardless, the cost of living in Houston is below average for large metro areas so you're not doing too bad, IMO. To be frank, however, you're not on a "superstar" path here--if you stay where you're at you will never increase your salary to the top end of the accepted range for your experience level.
Things you can do to improve your salary:
1. Get a new job.
2. Improve your written communication skills.
Regardless, the cost of living in Houston is below average for large metro areas so you're not doing too bad, IMO. To be frank, however, you're not on a "superstar" path here--if you stay where you're at you will never increase your salary to the top end of the accepted range for your experience level.