In my opinion , you have at least 2" too much in that jug, it just gives you problems that you don't need. It invites foaming over. It invites contamination. It forces a blow off tube.
I have never used a blow off tube, never had over foaming, never knowingly had contamination.
Secondary ? It's one of those , do it if you want to, I don't!
In the state you are , you may as well just let it keep going till it calms down and stays within the vessel, cooling it down will help. Keep spraying sanitiser all around the exterior and keep it as clean as possible.
Just chalk this one up to experience, and keep the level lower for next time.
Cool it down, keep it clean and get it right next time. Oh , and have fun , it's a great hobby.