So, in attempting to distill what may pass for facts from the  rhetoric:
a) given the choice, bees may tend to prefer to rear their young in sightly  
smaller cells than those in which they are usually encouraged to do so by the  
beekeeper, but can be very flexible.
b) given the choice, varroa mites may tend to prefer to rear their young in  
slightly larger cells, ideally drone cells, but can be very flexible.
c) varroa mites can lay just as many fertile eggs in small cells as in  large 
ones.
d) a smaller proportion of the mites emerging from small cells go on to  
breed than do those from large cells.
 
Have I got it right?  Have I missed anyhting?
 
Chris

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