Have you worn a hairpiece and realized that it had become challenging to blend it with your natural hair direction mainly because the ventilated hair (in the back) would not remain completely flat? Correct your knotting pattern.  Alternate between single and single split knots.  Split knot ventilation produces one hair strand with lift, as the other lays flat. Ventilate one row using only single knots, then simply ventilate the subsequent row making use of single split knots.