Wrist/Fingers Combination
Stumbled upon this by accident while I was trying to work on my overall endurance with my right hand.
Actually tried to play blast beats with my left wrist with french grip for the first time (usually played them with german grip; got problems using the fingers technique on my left hand) and thought it would be pretty cool to mix this with fingers.
Of course, still a bit sloppy and without metronom. But feels pretty good and relaxed compared to using only fingers.