You mentioned the rounding in your instagram post. I am definitely not an expert, but it looks like you are bringing your chest down to feel like you are getting your back at the right angle. I think this is where the proud chest cue would I'm in. You can also try to think of keeping your shoulder blades back and pushing together for a similar effect. The end goal is to get yourself pivoting at the hips and not at the upper back. Otherwise, these look like decent squats. Keep it up!