On Saturday, December 12, 2015 at 7:58:37 AM UTC-5, Martin Gregorie wrote:

In that case its a glider-specific issue. If I simply moved the flaps
from zero to landing, my ASW-20 lost 10-15 kts 'like that', but a
simultaneous shove on the stick made the speed loss go away.

Did the guy that signed of your type transition run you through any of this? He should have...