Another thing that might help in troubleshooting a neurotic mesh: Meshes seem to be primarily concerned with the integrity of their boundaries and any holes you might have. Surface contours can accept a high degree of screwiness. Maybe this helps to narrow down the search?
David Collins
Win10 64bit Intel i7 6700 3.40 Ghz, 32 Gb RAM, GeForce RTX 3070
AC 27.0 (4001 INT FULL)