Hey James,
I agree with both of the things you noticed. It may be helpful to wear some long socks for some proprioceptive feedback for the bar drifting forward. Yes, take another half second with the squeeze before the pull too. Other things:
You can tighten up the breathing/lockout situation. Try to breathe only at the bottom and not let air out at the top. Additionally, stand taller at the top, locking out knees and hips fully.
Nice work.
Ryan