First, it is absolutely essential that you LOCK YOUR ARMS OUT when taking the bar out of the rack over to the start position, directly above your shoulder joint. Anytime the bar passes over your face and neck, YOUR ARMS MUST BE ABSOLUTELY LOCKED OUT. You show a clear bend in the elbows here, and you need to stop that immediately.
Additionally:
1. Move the J-cups down one more hole.
2. Grip a little bit narrower. It's hard to say exactly how much narrower based on this vid, but I'd guess 1.5-2 finger widths on each side.
3. Don't pause the bar on your chest. Gentle touch-n-go.
4. Your scapulae must remain retracted throughout the set. Including unracking and locking out each rep. Keep them squeezed back even as you lock out your elbows. Which you haven't been doing, per the first thing above.
It is normal for it to feel harder to unrack the bar as it gets heavier. You should probably take the weight down to about 55-60kg to re-acclimate using the narrower grip and proper arm angle