After reading the feedback, I ran through some attack scenarios using the 'proper' scope method and then my own. Here are my conclusions:
1. The scope method depends on the type of ship you're targeting. This is really problematic when it's very dark or the ship is at an acute AoB.
2. The stadimeter is inaccurate. Strangely enough, this might be an unintentional piece of realism. With the advent of optical range finders, either stadia or coincidence, depends on a know length or height. Every navy had a ship's identification book with the data. Navy's would change or camouflage mast height or ship length to create errors in ranging.
3. I'm not totally convinced that a correct speed is obtainable with taking range measurements within 10 seconds.
So, I think I'm going to stick to my method of doing most of my metrics on the nav map and using Solution Solver. I did sink a destroyer at 2100 yds.! I think the crew had too much Sake the night before. Or it could have been Habu Sake.......
Thanks for all the input