Steve a suggestion i have that may help with this issue which i used and helped me when using bryce 5.5 and 6 with "Out of memory".

Before you inport the freak4 or Michael from daz to bryce hide/remove all body parts which will not be viewed in the image. EG: anything hidden by clothing. This will lower the file size down as well as the Bitmap Textures used by them..

 

I haven't used bryce in such a long time so i'm going on my memory here..hope it helps.

I have opinions of my own -- strong opinions -- but I don't always agree with them.