I've tried this Vectorworks to ArchiCAD trough IFC files, and it works well (even with Revit).
Keep an eye on the Model View Definition
used (Coordination view is geometrically speaking very reliable -previously called BREP)
Files must have Story heights
(AC) the same as Layer heights
(VW), this is not absolutely necessary, but helps.
If in trouble, always do a quality check
on the exported IFC file with a viewer like Solibri or BIMsight,
this will help you to check if the problem is in the export or import portion of the process.
Hope it helps
Director @ BuilDigital
Using, Archicad Latest AU and INT. Revit Latest (have to keep comparing notes)
More and more... IFC.js, IFCOpenShell
All things Solibri and BIMCollab