I believe that the
big issue causing nose up release is your forearm rotation as you swing through from your chest.
You can see that when the disc is even with your chest you have a more neutral position, with your palm facing your chest (or it may even feel like it's rotated upwards to you). Don't pay attention to the disc here, because I think you are just gripping it loosely so that the disc is "drooping". By the time you release I believe it has corrected to be in line with the palm as your grip naturally tightens.
As you move towards release, you lose that rotation and your palm is facing more towards the ground. I think that is causing the nose up release. You can see your hand is dipping below your elbow, which (I think) is a symptom of that pronation.
Josh at Overthrow was asked in the most recent form review video how you get nose down and his advice was (roughly and IIRC) to move towards supination (palm up) as you release. If you do that without a disc, I think you'll feel yourself get to that "pouring the tea" position.