Your technique is good. Your stroke and position are okay, but you sometimes make small mistakes related to your kicking technique. You’re looking for a wetsuit that meets your needs: maximum freedom in the upper body and extra flotability that helps you achieve a more effective and hydrodynamic horizontal position.
Maximum flexibility in the upper body that will not limit your movements or your technique.
Extra flotability in the lower body will enable you to maintain a horizontal posture, even when you’re tired.