1) Any setting to minimum the data distortion?
Common Boundary, No gap and no overlap before Complex Sharp>Mesh
Complex Shape (Before)
Problem 1 after Shape > Mesh (Gaps Occur)
Problem 2 after Shape > Mesh (Overlapping Occur)
Was this issue ever resolved Rayland? If not and you are Using OpenCities Map you might try the "Consder Z" setting, if the files are 3D: