When creating the symbol, are you selecting "Plan Projection Center"? This creates the insertion point at the center of the OBJECT, causing the symbol to appear at 0,0,0 in C4d regardless of its location in the VW drawing. If you select "Next Mouse Click" you can click at 0,0 in VW and it should maintain the offset when opened in C4D. If you place a Locus at 0,0 in VW, you'll have a point to click on.
Another option is to Group your model rather than creating a symbol. The group should maintain its position relative to 0,0 when imported.
George