Tuck your chin. Your head should be level, which means when you are at the bottom of the ROM, your face should be aimed toward the bar. This will keep your spine in alignment from the top down. The way you set up, with your head and chin up, has the c-spine in excess lordosis. You may also need to work your deep cervical spinal flexors, as it looks like your head is a bit forward in a resting posture.
Beyond that, I agree with everything Rodja said. Drop the bar.
And pulling barefoot is also a good idea. You can more easily spread the weight equally across the foot (versus sneakers where you are propelled forward) and it will bring you a bit closer to the bar, which is also advantageous.
Br