I just completed a little study on the honorchow website to determine what your calves are receiving. In my opinion, you would be wise to g r a d u a l l y switch over to the Finsihing Touch, but I wouldn't change back. If your calves get to finishing too soon, just reduce their intake. My question is: are you feeding the optional ration containing CTC? The big advantage here is that CTC will control those low level infections calves get all the time, that you never know about. Infection sure will mess with gain and condition.
Now, what I really believe to be the cause of your steers falling apart this time of year. I trust you started early with a daily grooming regiment of rinsing, brushing and blowing. Most everyone does this in conjunction with feeding. My guess is that this time of year, because of the cold and inclement weather, your daily routine is not near as routine as it was in the Summer/Fall. Even when calves are eating the proper percentage of feed, changes to their routine will cause many, not all, to "fall apart". Everything you do with a show calf should be done the same way, at the same time of day for optimal results. Just a hunch.