I don't have those files, but your changes are fine in regular files (I've tested them). Keep in mind rebooting the server.
If you continue experimenting the issue, I recommend you debug your server c++ project.
You could log the skill cooltime here:
bool CHARACTER::UseSkill(DWORD dwVnum, LPCHARACTER pkVictim, bool bUseGrandMaster) {
// ...
int iCooltime = (int) pkSk->kCooldownPoly.Eval();
// here you could add a breakpoint or log the iCooltime value
}
And the cooltime formula is usually read here: CClientManager::InitializeSkillTable(). You can also check over there. Maybe your files are not using the skill_proto db table.
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