Let's think about this. I know it seems that hitting with RISP is hugely important, and it is. And it's uncontrollable, except by one way: replace bad hitters with good hitters, irrespective of the situation. Refer to Sveumrules post (in a different thread?).
1) The Brewers did not hit badly with RISP compared to how they hit overall. In fact they hit better.
2) The Brewers did not hit badly with RISP compared to other teams. In fact they did better than most teams.
3) Hitting with RISP (relative to all situations) is mostly a random event; few players are consistently bad or consistently good from year to year (and probability suggests that there should be a small number of such "lucky" and "unlucky" players) .
4) Saying, "We need to improve our hitting with RISP," is like a Craps player saying, "I need to roll more sevens."