There is no L2GrandBoss. Just GrandBoss. Are you sure that it's working?
You can also try these SQL queries:
DELETE FROM npc WHERE id = 29020 OR id = 29021;
INSERT INTO `npc` VALUES ('29020', '29020', 'Baium', 0, '', 0, 'Monster.baium', 65.00, 174.00, 75, 'male', 'GrandBoss', 40, 1709400, 16377, 668.78, 3.09, 60, 57, 73, 76, 70, 80, 10253400, 1081544, 5488, 5412, 3605, 3283, 230, 0, 3819, 0, 0, 0, 117, 176, 'baium_clan', '3000', '0', '12', 'FULL_PARTY');
INSERT INTO `npc` VALUES ('29021', '29021', 'Archangel', 0, '', 0, 'Monster.archangel', '15.00', '60.00', 74, 'male', 'Monster', 60, '186915', '1342', '158', '3.00', 40, 43, 30, 21, 20, 20, 6571, 343, '2255', '8326', '606', '2500', 230, 500, 3819, 93, 0, 0, 117, 176, 'baium_clan', '3000', '0', '12', 'FULL_PARTY');