One of the things I took to heart as I have been lurking, for the most part, for the past couple of years, it the importance of getting course and speed of the target down as precisely as possible. The more solid the data, the more solid the solution.
Armistead- Switching between methods isn't really as hard as it sounds. Hundreds of reps imprint the aob/range & bearing changes that need to be made in the TDC. One thing that helps is, long ago, I figured out the lead angles for targets running at 6kts to 30kts for both fast (46kts) and slow (31kts) torp speeds. Printed them out, laminated them, and keep it nearby. That said, the Pacific is full of unexpended metal tubes sitting on the bottom with my name on them.
RR- The reason I set up for convoys and TFs using Cromwell is YOU! You clued me into the End Around. It didn't take a wedgie from the Admiral to figure out the advantages of being on the opposite side of the convoy as the escorts. I figured if I could get the first volley off with my boat already pointed half way toward the rear of the convoy, I can beat feet to rear that much faster.