I have working with carbon fibre parts over than a years but I've still strugle to have a shinny mould and also the parts, I mean after demoulds.  I never buffing the wax when  make a mould or parts (leave swirl), to emerge the shine surface because based on my experience "shine surface" would be hard to demould. My mould is made from epoxy gel coat, and the process is resin infusion using epoxy resin.