Originally Posted by MyBoyPuck
The only thing I see in your post that might help is the D-ring part. D-rings actually encourage the horse to lock his jaw a bit. Maybe an egg butt version of the same bit would get you a better response since it doesn't have as much of a bite to it. I know it sounds counter-productive to getting more control, but when my TB is feeling sassy, the softer bit seems to help by not picking a fight with him. Just don't bother with loose rings. Those will slide right through his mouth and you'll be heading for the trailer quickly.
How do you figure any of the above, in regards to D-ring versus loose ring versus. Eggbutt?
OP, has your horse been ridden in a curb, and how does he respond? You might consider a Pelham with a double rein, so you've got the extra bite if needed. But what's going to help you the most, I think, is just many more trail/beach miles, experience, practice, and wet saddle blankets.