Dear Sechel,
What you are calling the litvishe velt is not a cohesive group. There are several major yeshivos and dozens of other leaders. There is almost no uniformity among them. A question could be like what is the go to sefer for Chofetz Chaim or BMG or Torah Vdaas or The Mir. And still, each one of those yeshivos had multiple Rosh Yeshivos with different views and so on. The two yeshivos that do things one way the most, are Telz and Brisk. But even then there are several yesshivos and each one changes different than the others.
To be honest, each Chabad is unique and doesn’t do things in the exact same way.