I think the biggest key to slow downlines is careful throttle management over the top. On the Wind, it is draggy, but does not accelerate a lot on a downline if you are careful over the top. Understanding the plane doesn't slow down well on its own, you need to start coming off the throttle slightly earlier. Also, prop choice is very important in this. The new Falcon ultra light 20.5X14.5 is incredible at this because it is so light and doesn't stay spooled up.

Arch