There are also cap scripts in StatSystem.cpp . Check them.
void Player::UpdateParryPercentage()
{
const float parry_cap[MAX_CLASSES] =
{
65.631440f, // Warrior
65.631440f, // Paladin
145.560408f, // Hunter
145.560408f, // Rogue
0.0f, // Priest
65.631440f, // DK
145.560408f, // Shaman
0.0f, // Mage
0.0f, // Warlock
0.0f, // ??
0.0f // Druid
};
So, as I understand you need core script with your spells in cases to make them ignore stat caps.
Or just make higher caps for some classes.