What your stats don't show is game situations. Again we found success having batters take a strike against what we considered well below average speed pitchers and only during their first AB against said pitcher. We were very specific that it was the batters job to get their timing down and basically having them check swing to get the timing down.
Based on my prospective it seemed to be a very effective strategy. We never ran numbers to verify the strategy but it eliminated the quick 123 innings on 5 pitches against pitchers we thought were very "hitable." From observation, what we found was the slower pitchers were just as likely to struggle with the strike zone as the faster pitchers. Once the batters stopped jumping out of their shoes on the first or second pitch, because the ball looks HUGE when slowed down, it would turn into BP and big innings.