I saw one grey TB and my trainer said that his "neck comes out of is shoulder on the low side, which is common in TB's." She told me that this just gives them a first reaction to lift their head when they get off-balance. The horse is currently in training on the flat work, and the trainer can keep him perfectly round, but he will put his head up for a split second every now and then. He is still 5. More information on this please?
And please let me know about other conformation differences that can be fixable/non-fixable/trainable.