Just from the pics it looks like he is in the 850-950 lb range. Just my guess. I'm not sure if your fair is a hair show or not, but considering you have a black steer my guess is it's a hair show. At this point I would focus on getting him soft and putting cover on his ribs (fat). Achieving that while maintaining/adding bloom is critical. Not sure of your budget, but consider a product that will give you results in a short period of time for finishing. Considering you are switching to a finisher, if you are convinced and confident it will get the job done for you based on where you are now and your desired endpoint. Go for it. Trying to add more lean muscle at this point is the least of your concerns. I would stick with your current 12% ration and not switch and add to it for finishing him out. You know he eats your current ration. Will he eat the finishing ration consistently....? You stand to have more control of his conditioning by adding to his current ration. If you can afford wheat germ or soybean oil or Honor Show Chow Power Fuel then you can't go wrong. They work quickly and are proven. Corn works but he will have to consume more and is not good for promoting hair growth. Powerfuel helps with bloom also because it promotes hair growth. Couple either of the oils with Calf Manna or Sure Champ, stand back and let him go. Just my opinion. Keep it basic and trust your decision, whatever you decide. It's not rocket science! Good Luck!