One thing that needs tweaking is the pixel perfect sampling of the surface type.
Flying over small water bodies or forest patches produce instant sink and vice versa with lift producing surfaces.
This results in a very rough flying experience and is why our gliding community is now mostly flying in winter months.
There needs to be some accumulative calculation to smooth out these surface related up/downdrafts.
Same applies to the ridge lift. Not every small hill should be factured in the calculation the same way a huge mountain is.