You said a "Super Majority" voted for the soft fork, how many witnesses make a super Majority 17 of the top 20?

If you look on the witness list, out of the top 20, currently 17 are running the updated version. Some are supporting it but are not switched over yet. The actual number is something like 18 or 19 out of the top 20.

The lower ranked witnesses don't make much difference here; together they get one vote.