The spring (k1 kit) is for flaring 2-3, not hard shifts. It makes the car shift harder between 2-3.

He may just need a bowden cable/vac modulator adjustment.

Shifting firm is better than shifting slow

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k