What he should do is stop blowing all the way up to 185, and be disciplined and stick to walk around weight of 165 to 170. He clearly felt the affects of dropping from 185 to 154 this fight and paid the price.
The reason why he was world champ was because he used his size to his advantage. He wont have that at 160lbs. He will get mauled at the weight with his style.