Any recommendations for a hitting instructor in Houston? My children are 11 and 9. I've taken the 11 year old to a few instructors but they all taught "knob to ball", push swing mechanics so I've been going it alone, mostly using the Tewks ebook and website and Matt Lisle's videos. They're doing OK but we've struggled with a few things and could really use the help of a competent professional. We live in central Houston but would be willing to drive. Thanks!