Jolina's post in Max SP Asura and Nerf Assassin Link was marked as the answer
// Players' maximum HP rate? (Default is 100)
hp_rate: xx
// Players' maximum SP rate? (Default is 100)
sp_rate: xx
Take a look for that line.
About SB Soulink
Battle.c
switch (skill_num) {
case AS_SONICBLOW:
if (sc && sc->data[sC_SPIRIT] &&
sc->data[sC_SPIRIT]->val2 == SL_ASSASIN)
ATK_ADDRATE(map_flag_gvg(src->m)?25:100); //+25% dmg on woe/+100% dmg on nonwoe
if(sd && pc_checkskill(sd,AS_SONICACCEL)>0)
ATK_ADDRATE(10);
break;