I tried Xara and it was easier to use and also did not produce a line but did do the solid blocks so a double improvement but the two color shapes that butt together did not produce the same vectors for a common edge so it had gaps.

I just tried the online demo for vectormagic and its perfect. A very impressive conversion. Its not free - I think I get one or two free goes before I have to subscribe or buy the expensive bit of kit but it did give a darned good result so I can see the value of it.

So got past my issue for now.