The horse senses these things too. Your posture is telling your horse to slow down, stop, or fail. You are inadvertently training your horse to balk or hesitate. You carry yourself with your shoulders up, back straight, ready to react. Your horse can sense this too.
Timing is related to anticipation of the horses next move.
Well, then why don't you do something about it and keep the energy level up. Drive the horse through the corner with your seat if you think they may hesitate. A good example of support would be getting your horse to cross a river or stream. Your responsibility as the rider is to support the horse through this situation. In this case you should anticipate that the horse may stop or hesitate and you should drive the horse through the water with energy in your seat.