Longitude ground effect

Hey everyone,

Since the last update with avionics, I've been finding the longitude seems to have almost no ground effect and the flight model requires a lot of thrust and higher aoa than seems like it should. I'm flying with proper cog and weight distributions and flying stable approaches between vref and vap. Did something change with the flight model and is there any way to tweak the ground effect in the flight_model.cfg file? I see the line entry for it but playing with the numbers doesn't seem to make an appreciable difference at all.