Sounds like hes descibing the typicle thumnail shaped dark spot that is sometimes left in the top of a bullseye
Personaly with a bull I tend to use a long and strong vac cycle several times and watch the stuff flow in a stream to the injector Pressure a bull longer than what seems needed and then pressure cure I had a old repair guy tell me that if the dark half moon is at the top its probably air if its at the bottom it water since its denser and will flow down makes sence but not sure if its true
Personaly i think the resin shrinks a bit when it cures which is why I pressure cure em
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