Actually atmospheric flight is not quite buggy, but is rather limited and simplistic. Ideally, when flying on Earth, especially with my novelty warp planes, you're not supposed to need to keep the hover thrusters on at all times just to maintain level flight. For example, FAA regulations prohibit airspeeds faster than 250 knots (420 feet per second, 129 meters per second), whenever a craft is below 10000 feet AGL, and every single modern airliner
in the real world can fly just fine at that speed, under those altitudes, AND with flaps at 0. I think SE, either by design or by mistake, treats 1 bar at 1 g as if it were 0.1 bar at 1 g or 2 g. Correct me if I'm wrong, but I do not remember if improvements to aerodynamic flight is planned, since SE is more for Space Stuff than Aviation Stuff.