RE: F-20 have washout?
Don't worry all that much about the plane handling
As noted, the Sportsman and Kangke F-20 planes fly well. No bad habits. Set either up and balance it well, and you will have no problems. They fly like pattern aircraft. With the low-aspect ratio wings, and somewhat high wing loading - they are not very good gliders.
The DC / Juno F-20 flys very well. Landing speed is not that much higher than most heavy sport planes or other scale aircraft. The plane will simply start decending when you pull the power off. If you haul on the elevator with the power off, its going to simply fall out of the air.
(keep in mind the elevator does not always make the plane go up and down. Most of the ability to go up has to do with the big spinny thing up front)
On landing, just keep the speed up. Use the throttle, keep the nose down if needed. Practice lower speed handling up at altitude.
With experience, you will be able to land the plane with the nose 4 deg up, and use the throttle to control the decent rate (just like the full scale).