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If you're mould was porous, you'd definitely see evidence of air ingress during the infusion
As Hanaldo said, degassing is largely unnecessary to achieve perfect cosmetics. I too do infusions nearly every day and no longer bother using my degassing chamber as there has been no noticeable difference to parts even when starting the infusion very soon after mixing.
A lot of the trapped air will evacuate during the infusion process anyway and ensuring that enough resin has flowed to wet-out the stack is key to ensuring a perfect surface finish. Using resin breaks and making sure that every bit of your part has fully wet-out (even any excess peel ply near the exit) should ensure that your part comes out without voids, as appears to be the issue you've highlighted. Slowing things down is also helpful when using small-ish moulds
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