I have perfected my use of the surface and backing layers of your prepreg, but see room for improvement.  Even with the highest continuous run vacuum there are still some pinholes.  Also Id like to have a slight buffer to be able to wet sand and polish after molding.  Lastly the stray fiber from the surfacing layer can ruin the otherwise perfect surface.  

My results look just like the pictures posted......but they have pinholes.  In certain lights they look absolutely perfect, in others one can see the pinholes.  These are very very small pinholes, but there nonetheless.  My layup was sealed under the vac bladder, so all the epoxy stayed within the laminate, none was lost, but there were still pinholes.  I cant imagine how this happens if the layup retained all the epoxy.  In many cases the bag surface comes out perfectly and the tool surface suffers.  Confounding.  

What backing material are you using?

I must confess, I know this might be taboo........ but I leave the textured carrier layer on the last ply.  It really is the perfect release layer.  It is already intimately bonded with the prepreg, it is textured so it acts like a breather, it is thermally stable past where I cure, it does not absorb/retain any epoxy, I have had no problems with it.  If I could design a non porous breather/breather it would be the carrier material.  

I mean backing carbon. What do you mean by "textured carrier layer"? Peel ply?                           

I use the surfacing layer, then 2 layers of the 220g backing with a few strips of 220 reinforcment 

Must be lack of full vacuum, or curing ramp.

I use the surfacing layer, then 2 layers of the 220g backing with a few strips of 220 reinforcment