in renewal setting...there is a fixed cast rate...around 10% ~ 20% cast time is fixed...wont be affect by card / dex / items..
you have to disable that setting in order to gain the uncast
src/map/config/Renewal.h
* Renewal Cast Time
* @values: 1 (enabled) or 0 (disabled)
* 1 : Cast Time is decreased by DEX*2+INT, 20% of the cast time is not reduced by stats,
* - for example, on a skill whose cast time is 10s, only 8s may be reduced. other 2s are
* - part of a "fixed cast time" that is only reduced by special items and skills (such as
* - Arch Bishop's Sacrament skill).
* 0 : the old cast time method, influenced by dex, items and skills.
**/
#define RECASTING 1