Wanna spend a few hundred bucks a weekend on a wish & a hope you might get a pass here or there in Senior? Or do you want to make that investment in a dog that has real reason to pass each time? It's up to you. If your dog is starting to perform competently at the Master level in training, he's probably in that position.
Prepare your dog in such a manner that the work he is normally called upon to do under whelms him, not overwhelms him. Words to the wise.
Evan