I looked over your stat and they are interesting.
I guess the major question I have is, does your stat Leadoff Success really tell anything useful to a coach especially in a small sample such as a high school season. If a guy has 20, 40, or even 100 plate appearances in a season, reaching base even five or six times on errors leading off skews the use of any data since these had nothing to do with what the batter did. You can reach on an error on a rocket or the softest checked swing grounder. You can reach when you strike out and the catcher doesn't handle the pitch. One guy could get on base leading off on twelve hits in thirty AB's with no BB's but two ROE's and another guy could reach on eight hits, no BB's and seven errors. The second guy reached more times leading off, but he is no way the superior hitter leadoff or otherwise. You wouldn't put the second guy as your leadoff batter based on that. If there was found to be a relationship to reaching on errors and that players exceptional speed, then maybe it would be meaningful after all. However, the higher level the player plays at, the less times he will reach on errors as the fielders get better.
I will admit it is of interest to me if certain extremely fast guys reach base more on groundball or throwing errors than others(Ichiro, for example) because they cause infields to rush more often or play an extra step in, leading to more balls off their gloves. My son is extremely fast down the line as well as lefthanded and I would bet he reached more on errors than most teammates year after year when he was younger. At least it seemed that way to my prejudiced eyes.
I can tell you are passionate about your high school stat keeping though!