I am thinking to try a vinyl ester  infused soric and carbon mould for use with pre preg processing.

Laminate might be 6 layers 400g carbon each side of a 4mm soric (maybe 2 of 4mm soric in areas) to make a thicker stiffer mould.

Anybody tried using a soric mould like this? I know there maybe be air left within the soric cells but it all very well supported? Heat/expansion??

Or should I use a few layers of flow mesh or shade cloth and leave in the centre of the laminate? This would mean no air in the laminate leaving a core of resin/plastic mesh.

Ive used Corecork in infused moulds before. Bit different to Soric, but similar enough. 

Are you using a vinyl gelcoat John? Or just raw surface? If using a gelcoat then you'll be all good as you can sand/polish out any print through from the core. Air content in the core shouldn't present itself as an issue, 6 layers of carbon is plenty to resist blistering.