When I began ventilating,  I was too concerned about  ventilating the hair thickly.
Brue kept telling me, I did not need as much hair as I was using, and he was right.

I would hook 3-5 hair  strands at one time.
Not good,
 spread it out more and it is easier to clean  , cooler, and easier to remove tangles.

The foundation  is essentially invisable, it makes everything  much simpler if you thin the hair out as you hook it into place.
You can always go back and add more  hair strands at a later date