Flip your ration to 10 pounds beetpulp and 2 pounds grain, add a fat and a protein supplement to maintain the muscle and cover, monitor their weight, if they continue to gain to much pull the grain completely. You can up the feed in the end to help freshen them up.
The biggest thing in holding them and keeping them looking good is cutting calories while you still meet their nutritional needs, supplements is the only way to do that. They still need the fat and protein levels along with minerals to stay at what they were with full feed levels to maintain their condition