All excellent advices.
What I think many don't realize based on various discussions I had, is John's point about the impact of MC setting on safety glide. Many PDA soaring software going through the extra effort to sync the MC setting with the flight computer, which is a bad idea. The first thing you need to do when configuring your PDA soaring software is to decouple the MC setting between the two. Otherwise, when you fly conservatively (low MC setting) it will calculate way overly optimistic glides. As such you want to set the MC setting in your PDA high for safety while the MC setting in your Speed To Fly computer low, especially when trying to stay within safe glide of a waypoint. John's article explains this very well.

Ramy