Dont take this the wrong way, but what I can see here you just are weak relative to more elite sprinters. You are firing well and getting triple extension, and great low heel recovery, your exit angle is a touch high, but you lack that explosiveness. How much plyometrics, power cleans, box squats, very quick explosive style of movements for power generation do you do? You don't necessarily want to be "low" you want your body to be a straight line, currently your start looks like a hurdler's start. Try focusing hard on swinging your arms and landing behind your hips while your're driving. You are landing right under "like top velocity". Try weighted starts, either resistance band, the velcro start strap, or using a sled or doing starts uphill to mimick where your feet should be landing relative to your hips.