Element of surprise, first off find a full fledged boxing instructor, I am sure you have one but know it's time to get a GREAT one, your stand up game is full of holes and the help from a professional could make your fighting chances for a belt that much more interesting.
Learn a little Brazilian ju jitsu, not too much, you are already are a world class wrestler, if anything, taking on a grecco coach would be of more benefit, but back to the point , learning a little bjj will probably not take away from your wrestling, it has done that in the past to certain fighters. Learning just enough to acknowledge ju jitsu situations and how to defend against them would raise your shot at taking the belt up a few more points.
Muscle specific training, as a wrestler cutting weight and adding and losing muscle mass is nothing new to you. I would like to see a little bit of that pudge in the middle turned into bulletproof armour. Somewhere down the road someone will try to soften up the mid section and a tighter tummy will keep the best punchers from getting to you through your mid section, raising your stock a few more points.
Be more sound when on the ground, yes this may sound stupid for your ground game is why you are a top three heavyweight fighter, but you have to learn to finish more with tight smart holds, chokes, and locks. Punching your opposition into tapping will catch up with you eventually but learning to slap a kimura on a man in a second without tipping your hand will add more points to your arsenal.
All in all, what I am trying to say is it is the small things that you should work on, these things are not a big issue and could easily be added into your training , therefore making your path to the gold belt held so tightly by Mr. Brock Lesnar a smoother ride, and I am sure that after a hard fought victory tonight over Mr. Noguera, you will have a better understanding of what it will take for you to become the heavyweight champion of the world. Good luck on your mission son, the Mexican-American community is counting on you.