300 radius 10 target cap is way too strong. It makes Core Necro and Reaper completely obsolete. Taking away this would force every Scourge in WvW to learn how to use triple shade and make the other 2 grandmaster traits actually useful. They are both strong but in comparison to flat out hitting 10 players in such a big radius they fall flat.
My suggestion is to rework Sand Savant to do something such as "Any barrier left over on allies turns into healing" So if you gave an ally 6k barrier and it does not get damaged away it now turns into health. This suggestion is something realistic and in the theme of the Scourge especially since the first two top row Scourge traits have to do with Barrier. This change would not take along time to create since Sanctuary Runes are already in the game and do a similar effect. This would also make WvW fights less chaotic.
Just my suggestion after having over 4k hours on Scourge