It turns out the best way to get this airplane down is to roll to 90, kick opposite rudder, pull to get 3G's on the G-meter and keep the bank at 90 all the way down through 9,000 feet. You put a wingtip on a spot on the ground somewhere and keep it there until the plane is at pattern. Speed gets up to 160 or so. It's a little hard on the rudder and I wouldn't do it in rough air but it's fine otherwise and way faster than a slip. Some skydiver planes have hydraulic over electric speed brakes that get down even faster.

Also, a disclaimer is in order- the airplane shown in these pictures is FAA field-approved for the activity shown and is structurally improved accordingly. Don't try this in a non-approved airplane. Structural damage or possible loss of life may result.