Great to hear you're having so much fun!! :P
Just remember though when something changes i.e. the target on the floor and not in your hand relax previous standards. I would of clicked the horse for nearly touching it as to make it easy for him to succeed some horses wouldn't of been as enthusiastic as yours and would of given up trying. Remember this also when your training area changes i.e. from stable to school or vice versa, always click attempts in the correct direction if criteria has changed or been added.
Sounds like you have a very intelligent horse!!
Becky