One caveat - sometimes it seems like after using the speed brakes and crashing, on respawn the plane behaves like they are still applied and loses a tremendous amount of speed in any turn. The problem persists even after several respawns. To get rid of it it seems to work to delete the plane and then spawn it in from the Workshop again. Either the plane somehow "remembers" the flap settings (like sensors not being reset on respawn but more persistent) or the new aero is being "interesting" again, tbh I don't know anymore... 🙄