I believe minimum drag speed is what the FMS would tell you to hold at clean, for any type- about a few knots below minimum flaps-up speed, therefore flaps-up speed is a good no-brainer. You have too many other things to work on!
The secret of these is to be close to your airport, don't try and head too far to one, especially upwind. Lose altitude in 360 degree turns keeping in mind you want to be starting final approach from a base position at a good altitude. Don't remain clean too late, you have to leave time for flaps and gear operating at slower speeds and have to anticipate the use of extra drag rather than react to the requirement.
They were really good to do in the sim- really woke you up! The Copilot would be told to stop trying to restart for training purposes and enjoy the ride. I think it would be a good detail to throw in every 3 years.