FumeFX, REs and MoBlur

[Jordan]

Im rendering fumeFx from Final render with image motion blur on the fume and 3D motion blur on the matte objects. This works quite well but when I render out to render elements the FumeFX REs dont get motion blur.
I have saved out a FumeFX_Velocity RE and am using vector blur in Nuke on the REs to get a similar result but its always a bit broken. Is this the best workflow to use?