Thanks for the interesting question and explanation. The Run Expectancy chart reminds me of a question I've long had.
The values in the chart sum up the total number of expected runs among all instances of each outs-runners combo over the measurement time period, which includes all the "low leverage" (early innings, lopsided score, etc.)situations over that time period. I assume this kind of chart is used to derive late-game strategy which suggests that teams should (almost) never bunt. However, in late game situations a team may be looking for just a single run to tie, take a lead, or win. Has anyone ever counted the number of times for each of the outs-runners combos that at least one run has scored, i.e. a Run Probability chart? I assume so, but I ran an admittedly quick search and only found Run Expectancy charts.