Your back angle does not fuss me much. The way you start your squat and your bar path do, however. You are starting with the knees and then bending over. Break with the knees and the hips at the same time. The squat should not happen in segments. Smooth. Cut your depth off just a hair. Don't overextend your spine on the way up. Drive your ass up all the way to the top. Focus on keeping the bar over the mid foot the whole time. This will make your squat feel better. Lastly, sandwiches. Eat them.