I've able to fix this same issue of mine and I want to share the fix that I got.
go to src\map\
open status.cpp
at line 2692 or search this words below
// Percentual delay reduction from stats
amotion -= amotion * (4 * status->agi + status->dex) / 1000;
4. change the value of 1000(default) to your desired aspd. The lower the value the additional increase in aspd you will get.
5. ./configure your server