Haven't seen a post from you lately. How is the calf? I am treating one very similar to your calf. We have used the dex, LA, Pen, and Banamine. Our calf is very alert and "tells" us what is working and what doesn't. He was bought through a sale barn. He is 125lbs. guessing about 3 weeks old. The Banamine works best, along with the pen (long-acting). The Banamine helps with the inflamation and any fever. It makes him feel better.
I do have some other bits of info that might help. Let us know how the calf is doing.