At DIII more likely than not you need around 28 WIS rank to get into playoffs because there are always conferences with two teams outside of the top 32 playing for the conference championship game. Keep in mind SOS really means nothing when it comes to selection. It is the top 32 teams unless there are conference champs outside of that 32 that get in then you subtract that number from 32. SOS helps you get a higher WIS rank but outside of that has no effect on anything else.