Play regular man to man against 3 point shooting team.
Make sure to have good defenders guarding these guys.
The better the rebounding team the higher the + . I've gone with +5 in the past. Weak rebounders maybe +1 or +2
*Also, just because they are a good 3 point shooting team, doesn't always mean you should change your settings. A team that only shoot 8-10 3's per game, there would be a difference of one three point field goal between a good and bad shooting team.