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Yeh you can't use a flexible mould in a vacuum process, it just won't come out the right shape. If you need vacuum, you need a rigid mould.
The only way I can see carbon shoes being made nicely is using pre-preg with a rigid outer mould and a silicone intensifier inside. Ideally you would use the expansion of the silicone as the consolidation method, however I think to get the intensifier out again afterwards you would need to do it as a glove mould that you can collapse inwards on itself and still use vacuum as the consolidation. Then the silicone is just there to leave a smooth inner surface. Little bit trickier than I've made it sound there, it often doesn't work that easily.
Shoes certainly are not an easy thing to make, there is an art there for sure.