[boulanger]

and i found in core the issue in l2.gameserver.templates.item.ItemTemplate

 else if (this._exType == ExItemType.LOWER_PIECE)
        {
          attachFunc(new FuncTemplate(null, "EnchantRGrade", Stats.P_CRITICAL_DAMAGE, ordinal80, 0.0D));
          attachFunc(new FuncTemplate(null, "EnchantRGrade", Stats.M_CRITICAL_DAMAGE, ordinal80, 0.0D));
        }

Stats. M_CRITICAL_DAMAGE should be removed and added M_CRITICAL_DAMAGE_STATIC and problem solved .